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Energy Focus, Inc/DE – ‘10-K’ for 12/31/19 – ‘EX-101.LAB’

On:  Tuesday, 3/24/20, at 5:19pm ET   ·   For:  12/31/19   ·   Accession #:  924168-20-13   ·   File #:  1-36583

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  As Of               Filer                 Filing    For·On·As Docs:Size

 3/24/20  Energy Focus, Inc/DE              10-K       12/31/19   92:8.5M

Annual Report   —   Form 10-K   —   Sect. 13 / 15(d) – SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML    978K 
 6: EX-3.10     Articles of Incorporation/Organization or Bylaws    HTML     26K 
 2: EX-3.2      Articles of Incorporation/Organization or Bylaws    HTML     27K 
 3: EX-3.3      Articles of Incorporation/Organization or Bylaws    HTML     27K 
 4: EX-3.4      Articles of Incorporation/Organization or Bylaws    HTML     27K 
 5: EX-3.7      Articles of Incorporation/Organization or Bylaws    HTML     26K 
 7: EX-4.1      Instrument Defining the Rights of Security Holders  HTML     36K 
 8: EX-21.1     Subsidiaries List                                   HTML     22K 
 9: EX-23.1     Consent of Experts or Counsel                       HTML     24K 
10: EX-23.2     Consent of Experts or Counsel                       HTML     25K 
11: EX-31.1     Certification -- §302 - SOA'02                      HTML     32K 
12: EX-31.2     Certification -- §302 - SOA'02                      HTML     32K 
13: EX-32.1     Certification -- §906 - SOA'02                      HTML     27K 
35: R1          Document And Entity Information                     HTML     58K 
65: R2          Consolidated Balance Sheets                         HTML    142K 
90: R3          Consolidated Balance Sheets (Parenthetical)         HTML     46K 
47: R4          Consolidated Statements of Operations               HTML     78K 
34: R5          Consolidated Statements of Comprehensive Loss       HTML     38K 
63: R6          Consolidated Statements of Stockholders' Equity     HTML     68K 
88: R7          Consolidated Statements of Cash Flows               HTML    144K 
45: R8          Nature of Operations                                HTML     38K 
37: R9          Summary of Significant Accounting Policies          HTML     97K 
31: R10         Restructuring                                       HTML     61K 
43: R11         Leases                                              HTML    142K 
84: R12         Inventories                                         HTML     35K 
57: R13         Property and Equipment                              HTML     47K 
30: R14         Prepaid Expenses and Other Current Assets           HTML     37K 
42: R15         Accrued Liabilities                                 HTML     39K 
83: R16         Debt                                                HTML     49K 
56: R17         Commitments and Contingencies                       HTML     27K 
32: R18         Stockholders' Equity                                HTML    145K 
41: R19         Income Taxes                                        HTML     81K 
82: R20         Product and Geographic Information                  HTML     49K 
72: R21         Related Party Transactions                          HTML     35K 
27: R22         Legal Matters                                       HTML     27K 
55: R23         Subsequent Events                                   HTML     32K 
81: R24         Supplementary Financial Information to Item 8.      HTML     64K 
71: R25         Schedule II - Schedule of Valuation and Qualifying  HTML     63K 
                Accounts                                                         
26: R26         Summary of Significant Accounting Policies Summary  HTML    119K 
                of Significant Accounting (Policies)                             
54: R27         Summary of Significant Accounting Policies Summary  HTML     50K 
                of Significant Accounting Policies (Tables)                      
80: R28         Restructuring Restructuring (Tables)                HTML     39K 
73: R29         Leases (Tables)                                     HTML    104K 
59: R30         Inventories Inventories (Tables)                    HTML     36K 
85: R31         Property and Equipment Property and Equipment       HTML     44K 
                (Tables)                                                         
39: R32         Prepaid Expenses and Other Current Assets Prepaid   HTML     37K 
                Expenses and Other Current Assets (Tables)                       
28: R33         Accrued Liabilities Accrued Liabilities (Tables)    HTML     38K 
60: R34         Stockholders' Equity Stockholders' Equity (Tables)  HTML    140K 
86: R35         Income Taxes Income Taxes (Tables)                  HTML     77K 
40: R36         Product and Geographic Information (Tables)         HTML     50K 
29: R37         Supplementary Financial Information to Item 8.      HTML     62K 
                (Tables)                                                         
58: R38         Nature of Operations - Narrative (Details)          HTML     61K 
87: R39         Summary of Significant Accounting Policies -        HTML    115K 
                Narrative (Details)                                              
67: R40         Summary of Significant Accounting Policies -        HTML     37K 
                Reconciliation of Basic and Diluted Income (Loss)                
                per Share (Details)                                              
74: R41         Summary of Significant Accounting Policies -        HTML     34K 
                Schedule of Warranty Activity (Details)                          
52: R42         Restructuring - Narrative (Details)                 HTML     75K 
24: R43         Restructuring - Reconciliation of Restructuring     HTML     46K 
                Liability (Details)                                              
68: R44         Leases - Narrative (Details)                        HTML     45K 
75: R45         Leases - Components of Lease Cost (Details)         HTML     40K 
53: R46         Leases - Schedule of Supplemental Balance Sheet     HTML     43K 
                Information (Details)                                            
25: R47         Leases - Schedule of Future Maturities of Lease     HTML     98K 
                Liabilities (Details)                                            
66: R48         Leases - Schedule of Supplemental Cash Flow         HTML     30K 
                Information (Details)                                            
76: R49         Inventories - Schedule of Inventory (Details)       HTML     37K 
92: R50         Property and Equipment (Details)                    HTML     78K 
62: R51         Prepaid Expenses and Other Current Assets           HTML     43K 
                (Details)                                                        
38: R52         Accrued Liabilities (Details)                       HTML     48K 
46: R53         Debt - Narrative (Details)                          HTML    153K 
91: R54         Commitments and Contingencies - Narrative           HTML     30K 
                (Details)                                                        
61: R55         Stockholders' Equity - Narrative (Details)          HTML    101K 
36: R56         Stockholders' Equity - Impact of Results for        HTML     35K 
                Stock-Based Compensation (Details)                               
44: R57         Stockholders' Equity - Estimates Utilized           HTML     40K 
                (Details)                                                        
89: R58         Stockholders' Equity - Summary of Option Activity   HTML     64K 
                (Details)                                                        
64: R59         Stockholders' Equity - Options Outstanding and      HTML     72K 
                Exercisable (Details)                                            
22: R60         Stockholders' Equity - Summary of Restricted Stock  HTML     52K 
                Activity (Details)                                               
50: R61         Income Taxes - Narrative (Details)                  HTML     58K 
78: R62         Income Taxes - Components (Details)                 HTML     35K 
70: R63         Income Taxes - Reconciliation (Details)             HTML     45K 
20: R64         Income Taxes - Temporary Differences (Details)      HTML     44K 
49: R65         Product and Geographic Information (Details)        HTML     45K 
77: R66         Related Party Transactions (Details)                HTML     48K 
69: R67         Subsequent Events (Details)                         HTML     57K 
23: R68         Supplementary Financial Information to Item 8.      HTML     41K 
                (Details)                                                        
48: R69         Schedule II - Schedule of Valuation and Qualifying  HTML     40K 
                Accounts (Details)                                               
79: R9999       Uncategorized Items - efoi-20191231.xml             HTML     25K 
21: XML         IDEA XML File -- Filing Summary                      XML    151K 
51: EXCEL       IDEA Workbook of Financial Reports                  XLSX    102K 
14: EX-101.INS  XBRL Instance -- efoi-20191231                       XML   2.14M 
16: EX-101.CAL  XBRL Calculations -- efoi-20191231_cal               XML    284K 
17: EX-101.DEF  XBRL Definitions -- efoi-20191231_def                XML    597K 
18: EX-101.LAB  XBRL Labels -- efoi-20191231_lab                     XML   1.86M 
19: EX-101.PRE  XBRL Presentations -- efoi-20191231_pre              XML   1.06M 
15: EX-101.SCH  XBRL Schema -- efoi-20191231                         XSD    182K 
33: ZIP         XBRL Zipped Folder -- 0000924168-20-000013-xbrl      Zip    253K

‘EX-101.LAB’   —   XBRL Labels — efoi-20191231_lab

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<link:label id="lab_us-gaap_DebtDisclosureAbstract_9F7BFA74E5EC62E3B9A9E8BDE934C27B_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureAbstract_9F7BFA74E5EC62E3B9A9E8BDE934C27B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Disclosure [Abstract] </link:label>
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<link:label id="lab_us-gaap_DebtInstrumentTable_E62D57CB5FC40C9DC844E8BDE934D1B3_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTable_E62D57CB5FC40C9DC844E8BDE934D1B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Long-term Debt Instruments [Table] </link:label>
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<link:label id="lab_srt_RangeAxis_8ADB8BD5FA702FD37898E8BDE935478E_label_en-US" xlink:label="lab_srt_RangeAxis_8ADB8BD5FA702FD37898E8BDE935478E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statistical Measurement [Axis] </link:label>
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<link:label id="lab_srt_MaximumMember_FECC4539F448FC468CF3E8BDE9362CFA_label_en-US" xlink:label="lab_srt_MaximumMember_FECC4539F448FC468CF3E8BDE9362CFA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Maximum [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_FECC4539F448FC468CF3E8BDE9362CFA" xlink:type="locator"/>
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<link:label id="lab_efoi_DebtInstrumentPeriodAxis_D62F2459D3EAD51167EEE8BDE9367A16_terseLabel_en-US" xlink:label="lab_efoi_DebtInstrumentPeriodAxis_D62F2459D3EAD51167EEE8BDE9367A16" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Period [Axis] </link:label>
<link:label id="lab_efoi_DebtInstrumentPeriodAxis_D62F2459D3EAD51167EEE8BDE9367A16_label_en-US" xlink:label="lab_efoi_DebtInstrumentPeriodAxis_D62F2459D3EAD51167EEE8BDE9367A16" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Period [Axis] </link:label>
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<link:loc xlink:href="efoi-20191231.xsd#efoi_DebtInstrumentPeriodAxis" xlink:label="loc_efoi_DebtInstrumentPeriodAxis_D62F2459D3EAD51167EEE8BDE9367A16" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_DebtInstrumentPeriodAxis_D62F2459D3EAD51167EEE8BDE9367A16" xlink:to="lab_efoi_DebtInstrumentPeriodAxis_D62F2459D3EAD51167EEE8BDE9367A16" xlink:type="arc"/>
<link:label id="lab_efoi_DebtInstrumentPeriodDomain_6B5E46C6FF194584E902E8BDE9361AE3_terseLabel_en-US" xlink:label="lab_efoi_DebtInstrumentPeriodDomain_6B5E46C6FF194584E902E8BDE9361AE3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Period [Domain] </link:label>
<link:label id="lab_efoi_DebtInstrumentPeriodDomain_6B5E46C6FF194584E902E8BDE9361AE3_label_en-US" xlink:label="lab_efoi_DebtInstrumentPeriodDomain_6B5E46C6FF194584E902E8BDE9361AE3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Period [Domain] </link:label>
<link:label id="lab_efoi_DebtInstrumentPeriodDomain_6B5E46C6FF194584E902E8BDE9361AE3_documentation_en-US" xlink:label="lab_efoi_DebtInstrumentPeriodDomain_6B5E46C6FF194584E902E8BDE9361AE3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> [Domain] for Debt Instrument, Period [Axis] </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_DebtInstrumentPeriodDomain" xlink:label="loc_efoi_DebtInstrumentPeriodDomain_6B5E46C6FF194584E902E8BDE9361AE3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_DebtInstrumentPeriodDomain_6B5E46C6FF194584E902E8BDE9361AE3" xlink:to="lab_efoi_DebtInstrumentPeriodDomain_6B5E46C6FF194584E902E8BDE9361AE3" xlink:type="arc"/>
<link:label id="lab_efoi_DebtInstrumentPeriodOneMember_37BA8D556F3B7C5C0DA6E8BDE93616C5_terseLabel_en-US" xlink:label="lab_efoi_DebtInstrumentPeriodOneMember_37BA8D556F3B7C5C0DA6E8BDE93616C5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Year One </link:label>
<link:label id="lab_efoi_DebtInstrumentPeriodOneMember_37BA8D556F3B7C5C0DA6E8BDE93616C5_label_en-US" xlink:label="lab_efoi_DebtInstrumentPeriodOneMember_37BA8D556F3B7C5C0DA6E8BDE93616C5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Period One [Member] </link:label>
<link:label id="lab_efoi_DebtInstrumentPeriodOneMember_37BA8D556F3B7C5C0DA6E8BDE93616C5_documentation_en-US" xlink:label="lab_efoi_DebtInstrumentPeriodOneMember_37BA8D556F3B7C5C0DA6E8BDE93616C5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Period One [Member] </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_DebtInstrumentPeriodOneMember" xlink:label="loc_efoi_DebtInstrumentPeriodOneMember_37BA8D556F3B7C5C0DA6E8BDE93616C5" xlink:type="locator"/>
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<link:label id="lab_efoi_DebtInstrumentPeriodTwoMember_7A4774D97937B1E4CB9EE8BDE9376D2C_terseLabel_en-US" xlink:label="lab_efoi_DebtInstrumentPeriodTwoMember_7A4774D97937B1E4CB9EE8BDE9376D2C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Year Two </link:label>
<link:label id="lab_efoi_DebtInstrumentPeriodTwoMember_7A4774D97937B1E4CB9EE8BDE9376D2C_label_en-US" xlink:label="lab_efoi_DebtInstrumentPeriodTwoMember_7A4774D97937B1E4CB9EE8BDE9376D2C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Period Two [Member] </link:label>
<link:label id="lab_efoi_DebtInstrumentPeriodTwoMember_7A4774D97937B1E4CB9EE8BDE9376D2C_documentation_en-US" xlink:label="lab_efoi_DebtInstrumentPeriodTwoMember_7A4774D97937B1E4CB9EE8BDE9376D2C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Period Two [Member] </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_DebtInstrumentPeriodTwoMember" xlink:label="loc_efoi_DebtInstrumentPeriodTwoMember_7A4774D97937B1E4CB9EE8BDE9376D2C" xlink:type="locator"/>
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<link:label id="lab_efoi_NotePurchaseAgreementMember_46B45E8984A362E459D2E8BDE93829B4_terseLabel_en-US" xlink:label="lab_efoi_NotePurchaseAgreementMember_46B45E8984A362E459D2E8BDE93829B4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Note Purchase Agreement </link:label>
<link:label id="lab_efoi_NotePurchaseAgreementMember_46B45E8984A362E459D2E8BDE93829B4_label_en-US" xlink:label="lab_efoi_NotePurchaseAgreementMember_46B45E8984A362E459D2E8BDE93829B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Note Purchase Agreement [Member] </link:label>
<link:label id="lab_efoi_NotePurchaseAgreementMember_46B45E8984A362E459D2E8BDE93829B4_documentation_en-US" xlink:label="lab_efoi_NotePurchaseAgreementMember_46B45E8984A362E459D2E8BDE93829B4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Note Purchase Agreement [Member] </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_NotePurchaseAgreementMember" xlink:label="loc_efoi_NotePurchaseAgreementMember_46B45E8984A362E459D2E8BDE93829B4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_NotePurchaseAgreementMember_46B45E8984A362E459D2E8BDE93829B4" xlink:to="lab_efoi_NotePurchaseAgreementMember_46B45E8984A362E459D2E8BDE93829B4" xlink:type="arc"/>
<link:label id="lab_us-gaap_StatementClassOfStockAxis_6226AEBBBEAD0D2ED179E8BDE938DD22_terseLabel_en-US" xlink:label="lab_us-gaap_StatementClassOfStockAxis_6226AEBBBEAD0D2ED179E8BDE938DD22" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Class of Stock [Axis] </link:label>
<link:label id="lab_us-gaap_StatementClassOfStockAxis_6226AEBBBEAD0D2ED179E8BDE938DD22_label_en-US" xlink:label="lab_us-gaap_StatementClassOfStockAxis_6226AEBBBEAD0D2ED179E8BDE938DD22" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Stock [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_6226AEBBBEAD0D2ED179E8BDE938DD22" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementClassOfStockAxis_6226AEBBBEAD0D2ED179E8BDE938DD22" xlink:to="lab_us-gaap_StatementClassOfStockAxis_6226AEBBBEAD0D2ED179E8BDE938DD22" xlink:type="arc"/>
<link:label id="lab_us-gaap_ClassOfStockDomain_398AF1A4CE8E92A394CEE8BDE9384056_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain_398AF1A4CE8E92A394CEE8BDE9384056" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Class of Stock [Domain] </link:label>
<link:label id="lab_us-gaap_ClassOfStockDomain_398AF1A4CE8E92A394CEE8BDE9384056_label_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain_398AF1A4CE8E92A394CEE8BDE9384056" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Stock [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_398AF1A4CE8E92A394CEE8BDE9384056" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfStockDomain_398AF1A4CE8E92A394CEE8BDE9384056" xlink:to="lab_us-gaap_ClassOfStockDomain_398AF1A4CE8E92A394CEE8BDE9384056" xlink:type="arc"/>
<link:label id="lab_us-gaap_SeriesAPreferredStockMember_81ED7A42DF5883644E68E8BDE939CC1C_terseLabel_en-US" xlink:label="lab_us-gaap_SeriesAPreferredStockMember_81ED7A42DF5883644E68E8BDE939CC1C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Series A Preferred Stock </link:label>
<link:label id="lab_us-gaap_SeriesAPreferredStockMember_81ED7A42DF5883644E68E8BDE939CC1C_label_en-US" xlink:label="lab_us-gaap_SeriesAPreferredStockMember_81ED7A42DF5883644E68E8BDE939CC1C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Series A Preferred Stock [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SeriesAPreferredStockMember" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_81ED7A42DF5883644E68E8BDE939CC1C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SeriesAPreferredStockMember_81ED7A42DF5883644E68E8BDE939CC1C" xlink:to="lab_us-gaap_SeriesAPreferredStockMember_81ED7A42DF5883644E68E8BDE939CC1C" xlink:type="arc"/>
<link:label id="lab_us-gaap_LongtermDebtTypeAxis_33F73F96EFB6BDAB34D8E8BDE9392557_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_33F73F96EFB6BDAB34D8E8BDE9392557" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Type [Axis] </link:label>
<link:label id="lab_us-gaap_LongtermDebtTypeAxis_33F73F96EFB6BDAB34D8E8BDE9392557_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_33F73F96EFB6BDAB34D8E8BDE9392557" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Type [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_33F73F96EFB6BDAB34D8E8BDE9392557" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_33F73F96EFB6BDAB34D8E8BDE9392557" xlink:to="lab_us-gaap_LongtermDebtTypeAxis_33F73F96EFB6BDAB34D8E8BDE9392557" xlink:type="arc"/>
<link:label id="lab_us-gaap_LongtermDebtTypeDomain_DE1F17E0DC5205839D36E8BDE939FF29_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_DE1F17E0DC5205839D36E8BDE939FF29" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Type [Domain] </link:label>
<link:label id="lab_us-gaap_LongtermDebtTypeDomain_DE1F17E0DC5205839D36E8BDE939FF29_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_DE1F17E0DC5205839D36E8BDE939FF29" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Type [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_DE1F17E0DC5205839D36E8BDE939FF29" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DE1F17E0DC5205839D36E8BDE939FF29" xlink:to="lab_us-gaap_LongtermDebtTypeDomain_DE1F17E0DC5205839D36E8BDE939FF29" xlink:type="arc"/>
<link:label id="lab_us-gaap_ConvertibleDebtMember_3DB10C53F6B85F7FADBBE8BDE939D446_terseLabel_en-US" xlink:label="lab_us-gaap_ConvertibleDebtMember_3DB10C53F6B85F7FADBBE8BDE939D446" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Convertible Debt </link:label>
<link:label id="lab_us-gaap_ConvertibleDebtMember_3DB10C53F6B85F7FADBBE8BDE939D446_label_en-US" xlink:label="lab_us-gaap_ConvertibleDebtMember_3DB10C53F6B85F7FADBBE8BDE939D446" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Convertible Debt [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConvertibleDebtMember" xlink:label="loc_us-gaap_ConvertibleDebtMember_3DB10C53F6B85F7FADBBE8BDE939D446" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConvertibleDebtMember_3DB10C53F6B85F7FADBBE8BDE939D446" xlink:to="lab_us-gaap_ConvertibleDebtMember_3DB10C53F6B85F7FADBBE8BDE939D446" xlink:type="arc"/>
<link:label id="lab_us-gaap_VariableRateAxis_3964E18CEAFEBBBFD529E8BDE93A477F_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateAxis_3964E18CEAFEBBBFD529E8BDE93A477F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Variable Rate [Axis] </link:label>
<link:label id="lab_us-gaap_VariableRateAxis_3964E18CEAFEBBBFD529E8BDE93A477F_label_en-US" xlink:label="lab_us-gaap_VariableRateAxis_3964E18CEAFEBBBFD529E8BDE93A477F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Variable Rate [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_3964E18CEAFEBBBFD529E8BDE93A477F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableRateAxis_3964E18CEAFEBBBFD529E8BDE93A477F" xlink:to="lab_us-gaap_VariableRateAxis_3964E18CEAFEBBBFD529E8BDE93A477F" xlink:type="arc"/>
<link:label id="lab_us-gaap_VariableRateDomain_A50DEBE88E3AA35A127BE8BDE93A4B67_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateDomain_A50DEBE88E3AA35A127BE8BDE93A4B67" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Variable Rate [Domain] </link:label>
<link:label id="lab_us-gaap_VariableRateDomain_A50DEBE88E3AA35A127BE8BDE93A4B67_label_en-US" xlink:label="lab_us-gaap_VariableRateDomain_A50DEBE88E3AA35A127BE8BDE93A4B67" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Variable Rate [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_A50DEBE88E3AA35A127BE8BDE93A4B67" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableRateDomain_A50DEBE88E3AA35A127BE8BDE93A4B67" xlink:to="lab_us-gaap_VariableRateDomain_A50DEBE88E3AA35A127BE8BDE93A4B67" xlink:type="arc"/>
<link:label id="lab_us-gaap_PrimeRateMember_FBB6D80D6FF8EA02F5FCE8BDE93A5EA1_terseLabel_en-US" xlink:label="lab_us-gaap_PrimeRateMember_FBB6D80D6FF8EA02F5FCE8BDE93A5EA1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Prime Rate </link:label>
<link:label id="lab_us-gaap_PrimeRateMember_FBB6D80D6FF8EA02F5FCE8BDE93A5EA1_label_en-US" xlink:label="lab_us-gaap_PrimeRateMember_FBB6D80D6FF8EA02F5FCE8BDE93A5EA1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Prime Rate [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrimeRateMember" xlink:label="loc_us-gaap_PrimeRateMember_FBB6D80D6FF8EA02F5FCE8BDE93A5EA1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PrimeRateMember_FBB6D80D6FF8EA02F5FCE8BDE93A5EA1" xlink:to="lab_us-gaap_PrimeRateMember_FBB6D80D6FF8EA02F5FCE8BDE93A5EA1" xlink:type="arc"/>
<link:label id="lab_us-gaap_CreditFacilityAxis_4B5915C27C973606C3D6E8BDE93A81DD_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_4B5915C27C973606C3D6E8BDE93A81DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit Facility [Axis] </link:label>
<link:label id="lab_us-gaap_CreditFacilityAxis_4B5915C27C973606C3D6E8BDE93A81DD_label_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_4B5915C27C973606C3D6E8BDE93A81DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Credit Facility [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_4B5915C27C973606C3D6E8BDE93A81DD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CreditFacilityAxis_4B5915C27C973606C3D6E8BDE93A81DD" xlink:to="lab_us-gaap_CreditFacilityAxis_4B5915C27C973606C3D6E8BDE93A81DD" xlink:type="arc"/>
<link:label id="lab_us-gaap_CreditFacilityDomain_A50B6988DB99A8279F8EE8BDE93A4095_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_A50B6988DB99A8279F8EE8BDE93A4095" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit Facility [Domain] </link:label>
<link:label id="lab_us-gaap_CreditFacilityDomain_A50B6988DB99A8279F8EE8BDE93A4095_label_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_A50B6988DB99A8279F8EE8BDE93A4095" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Credit Facility [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_A50B6988DB99A8279F8EE8BDE93A4095" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CreditFacilityDomain_A50B6988DB99A8279F8EE8BDE93A4095" xlink:to="lab_us-gaap_CreditFacilityDomain_A50B6988DB99A8279F8EE8BDE93A4095" xlink:type="arc"/>
<link:label id="lab_us-gaap_RevolvingCreditFacilityMember_2AC36CF11D98C15203B5E8BDE93BDC35_terseLabel_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_2AC36CF11D98C15203B5E8BDE93BDC35" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revolving Credit Facility </link:label>
<link:label id="lab_us-gaap_RevolvingCreditFacilityMember_2AC36CF11D98C15203B5E8BDE93BDC35_label_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_2AC36CF11D98C15203B5E8BDE93BDC35" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revolving Credit Facility [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_2AC36CF11D98C15203B5E8BDE93BDC35" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevolvingCreditFacilityMember_2AC36CF11D98C15203B5E8BDE93BDC35" xlink:to="lab_us-gaap_RevolvingCreditFacilityMember_2AC36CF11D98C15203B5E8BDE93BDC35" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentLineItems_0C1D767F5770C875A83FE8BDE93BE774_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_0C1D767F5770C875A83FE8BDE93BE774" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument [Line Items] </link:label>
<link:label id="lab_us-gaap_DebtInstrumentLineItems_0C1D767F5770C875A83FE8BDE93BE774_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_0C1D767F5770C875A83FE8BDE93BE774" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_0C1D767F5770C875A83FE8BDE93BE774" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0C1D767F5770C875A83FE8BDE93BE774" xlink:to="lab_us-gaap_DebtInstrumentLineItems_0C1D767F5770C875A83FE8BDE93BE774" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentTerm_49335D4A77633767CA77E8BDE93B2E0E_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentTerm_49335D4A77633767CA77E8BDE93B2E0E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit facility, term </link:label>
<link:label id="lab_us-gaap_DebtInstrumentTerm_49335D4A77633767CA77E8BDE93B2E0E_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTerm_49335D4A77633767CA77E8BDE93B2E0E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Term </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTerm" xlink:label="loc_us-gaap_DebtInstrumentTerm_49335D4A77633767CA77E8BDE93B2E0E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_BCB627F23DC732567799E8BDE93CF78C_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_BCB627F23DC732567799E8BDE93CF78C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit facility, maximum borrowing capacity </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_BCB627F23DC732567799E8BDE93CF78C_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_BCB627F23DC732567799E8BDE93CF78C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Maximum Borrowing Capacity </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_BCB627F23DC732567799E8BDE93CF78C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_BCB627F23DC732567799E8BDE93CF78C" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_BCB627F23DC732567799E8BDE93CF78C" xlink:type="arc"/>
<link:label id="lab_efoi_LineOfCreditFacilityAvailablePercentageOfReceivables_F66267469B46C5D91172E8BDE93CA1CD_terseLabel_en-US" xlink:label="lab_efoi_LineOfCreditFacilityAvailablePercentageOfReceivables_F66267469B46C5D91172E8BDE93CA1CD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit facility, net eligible receivables, percent </link:label>
<link:label id="lab_efoi_LineOfCreditFacilityAvailablePercentageOfReceivables_F66267469B46C5D91172E8BDE93CA1CD_label_en-US" xlink:label="lab_efoi_LineOfCreditFacilityAvailablePercentageOfReceivables_F66267469B46C5D91172E8BDE93CA1CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility Available Percentage of Receivables </link:label>
<link:label id="lab_efoi_LineOfCreditFacilityAvailablePercentageOfReceivables_F66267469B46C5D91172E8BDE93CA1CD_documentation_en-US" xlink:label="lab_efoi_LineOfCreditFacilityAvailablePercentageOfReceivables_F66267469B46C5D91172E8BDE93CA1CD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The percentage of eligible receivables which determines the amount of line of credit available. </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_LineOfCreditFacilityAvailablePercentageOfReceivables" xlink:label="loc_efoi_LineOfCreditFacilityAvailablePercentageOfReceivables_F66267469B46C5D91172E8BDE93CA1CD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_LineOfCreditFacilityAvailablePercentageOfReceivables_F66267469B46C5D91172E8BDE93CA1CD" xlink:to="lab_efoi_LineOfCreditFacilityAvailablePercentageOfReceivables_F66267469B46C5D91172E8BDE93CA1CD" xlink:type="arc"/>
<link:label id="lab_efoi_LineofCreditFacilityQualifiedAccountsReceivableAmount_E23C3ED9700B47751BF8E8BDE93CE42F_terseLabel_en-US" xlink:label="lab_efoi_LineofCreditFacilityQualifiedAccountsReceivableAmount_E23C3ED9700B47751BF8E8BDE93CE42F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit facility, qualified receivable </link:label>
<link:label id="lab_efoi_LineofCreditFacilityQualifiedAccountsReceivableAmount_E23C3ED9700B47751BF8E8BDE93CE42F_label_en-US" xlink:label="lab_efoi_LineofCreditFacilityQualifiedAccountsReceivableAmount_E23C3ED9700B47751BF8E8BDE93CE42F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Qualified Accounts Receivable, Amount </link:label>
<link:label id="lab_efoi_LineofCreditFacilityQualifiedAccountsReceivableAmount_E23C3ED9700B47751BF8E8BDE93CE42F_documentation_en-US" xlink:label="lab_efoi_LineofCreditFacilityQualifiedAccountsReceivableAmount_E23C3ED9700B47751BF8E8BDE93CE42F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Qualified Accounts Receivable, Amount </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_LineofCreditFacilityQualifiedAccountsReceivableAmount" xlink:label="loc_efoi_LineofCreditFacilityQualifiedAccountsReceivableAmount_E23C3ED9700B47751BF8E8BDE93CE42F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_LineofCreditFacilityQualifiedAccountsReceivableAmount_E23C3ED9700B47751BF8E8BDE93CE42F" xlink:to="lab_efoi_LineofCreditFacilityQualifiedAccountsReceivableAmount_E23C3ED9700B47751BF8E8BDE93CE42F" xlink:type="arc"/>
<link:label id="lab_efoi_LineOfCreditFacilityAvailableThresholdPercent_4422CC4356483B733E59E8BDE93C5C2A_terseLabel_en-US" xlink:label="lab_efoi_LineOfCreditFacilityAvailableThresholdPercent_4422CC4356483B733E59E8BDE93C5C2A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit facility, available threshold, percent </link:label>
<link:label id="lab_efoi_LineOfCreditFacilityAvailableThresholdPercent_4422CC4356483B733E59E8BDE93C5C2A_label_en-US" xlink:label="lab_efoi_LineOfCreditFacilityAvailableThresholdPercent_4422CC4356483B733E59E8BDE93C5C2A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility Available Threshold Percent </link:label>
<link:label id="lab_efoi_LineOfCreditFacilityAvailableThresholdPercent_4422CC4356483B733E59E8BDE93C5C2A_documentation_en-US" xlink:label="lab_efoi_LineOfCreditFacilityAvailableThresholdPercent_4422CC4356483B733E59E8BDE93C5C2A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The threshold for determining the available line of credit with regards to the lessor of the percentage of lower of cost or market value of inventory or a predetermined value. </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_LineOfCreditFacilityAvailableThresholdPercent" xlink:label="loc_efoi_LineOfCreditFacilityAvailableThresholdPercent_4422CC4356483B733E59E8BDE93C5C2A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_LineOfCreditFacilityAvailableThresholdPercent_4422CC4356483B733E59E8BDE93C5C2A" xlink:to="lab_efoi_LineOfCreditFacilityAvailableThresholdPercent_4422CC4356483B733E59E8BDE93C5C2A" xlink:type="arc"/>
<link:label id="lab_efoi_LineOfCreditFacilityAvailableThresholdValue_21697F26B163F658560EE8BDE93C5EE2_terseLabel_en-US" xlink:label="lab_efoi_LineOfCreditFacilityAvailableThresholdValue_21697F26B163F658560EE8BDE93C5EE2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit facility, available threshold </link:label>
<link:label id="lab_efoi_LineOfCreditFacilityAvailableThresholdValue_21697F26B163F658560EE8BDE93C5EE2_label_en-US" xlink:label="lab_efoi_LineOfCreditFacilityAvailableThresholdValue_21697F26B163F658560EE8BDE93C5EE2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility Available Threshold Value </link:label>
<link:label id="lab_efoi_LineOfCreditFacilityAvailableThresholdValue_21697F26B163F658560EE8BDE93C5EE2_documentation_en-US" xlink:label="lab_efoi_LineOfCreditFacilityAvailableThresholdValue_21697F26B163F658560EE8BDE93C5EE2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The threshold for determining the available line of credit with regards to the lessor of the percentage of lower of cost or market value of inventory or a predetermined value. </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_LineOfCreditFacilityAvailableThresholdValue" xlink:label="loc_efoi_LineOfCreditFacilityAvailableThresholdValue_21697F26B163F658560EE8BDE93C5EE2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_LineOfCreditFacilityAvailableThresholdValue_21697F26B163F658560EE8BDE93C5EE2" xlink:to="lab_efoi_LineOfCreditFacilityAvailableThresholdValue_21697F26B163F658560EE8BDE93C5EE2" xlink:type="arc"/>
<link:label id="lab_efoi_LineofCreditFacilityMinimumBorrowingCapacity_028DDB70B2604BE5FB94E8BDE93CE82F_terseLabel_en-US" xlink:label="lab_efoi_LineofCreditFacilityMinimumBorrowingCapacity_028DDB70B2604BE5FB94E8BDE93CE82F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit facility, minimum borrowing capacity </link:label>
<link:label id="lab_efoi_LineofCreditFacilityMinimumBorrowingCapacity_028DDB70B2604BE5FB94E8BDE93CE82F_label_en-US" xlink:label="lab_efoi_LineofCreditFacilityMinimumBorrowingCapacity_028DDB70B2604BE5FB94E8BDE93CE82F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Minimum Borrowing Capacity </link:label>
<link:label id="lab_efoi_LineofCreditFacilityMinimumBorrowingCapacity_028DDB70B2604BE5FB94E8BDE93CE82F_documentation_en-US" xlink:label="lab_efoi_LineofCreditFacilityMinimumBorrowingCapacity_028DDB70B2604BE5FB94E8BDE93CE82F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Minimum Borrowing Capacity </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_LineofCreditFacilityMinimumBorrowingCapacity" xlink:label="loc_efoi_LineofCreditFacilityMinimumBorrowingCapacity_028DDB70B2604BE5FB94E8BDE93CE82F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_LineofCreditFacilityMinimumBorrowingCapacity_028DDB70B2604BE5FB94E8BDE93CE82F" xlink:to="lab_efoi_LineofCreditFacilityMinimumBorrowingCapacity_028DDB70B2604BE5FB94E8BDE93CE82F" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_F689D8530F0C0539B679E8BDE93DF347_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_F689D8530F0C0539B679E8BDE93DF347" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit facility, basis spread on variable rate </link:label>
<link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_F689D8530F0C0539B679E8BDE93DF347_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_F689D8530F0C0539B679E8BDE93DF347" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Basis Spread on Variable Rate </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_F689D8530F0C0539B679E8BDE93DF347" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_F689D8530F0C0539B679E8BDE93DF347" xlink:to="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_F689D8530F0C0539B679E8BDE93DF347" xlink:type="arc"/>
<link:label id="lab_efoi_LineOfCreditFacilityOverdraftFeePercentage_AFAA7330E590023A4449E8BDE93DD92E_terseLabel_en-US" xlink:label="lab_efoi_LineOfCreditFacilityOverdraftFeePercentage_AFAA7330E590023A4449E8BDE93DD92E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit facility, overdraft fee percentage </link:label>
<link:label id="lab_efoi_LineOfCreditFacilityOverdraftFeePercentage_AFAA7330E590023A4449E8BDE93DD92E_label_en-US" xlink:label="lab_efoi_LineOfCreditFacilityOverdraftFeePercentage_AFAA7330E590023A4449E8BDE93DD92E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line Of Credit Facility, Overdraft Fee Percentage </link:label>
<link:label id="lab_efoi_LineOfCreditFacilityOverdraftFeePercentage_AFAA7330E590023A4449E8BDE93DD92E_documentation_en-US" xlink:label="lab_efoi_LineOfCreditFacilityOverdraftFeePercentage_AFAA7330E590023A4449E8BDE93DD92E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Line Of Credit Facility, Overdraft Fee Percentage </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_LineOfCreditFacilityOverdraftFeePercentage" xlink:label="loc_efoi_LineOfCreditFacilityOverdraftFeePercentage_AFAA7330E590023A4449E8BDE93DD92E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_LineOfCreditFacilityOverdraftFeePercentage_AFAA7330E590023A4449E8BDE93DD92E" xlink:to="lab_efoi_LineOfCreditFacilityOverdraftFeePercentage_AFAA7330E590023A4449E8BDE93DD92E" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_9EC590D4BB591BAA8D0EE8BDE93D0140_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_9EC590D4BB591BAA8D0EE8BDE93D0140" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stated interest rate </link:label>
<link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_9EC590D4BB591BAA8D0EE8BDE93D0140_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_9EC590D4BB591BAA8D0EE8BDE93D0140" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Interest Rate, Stated Percentage </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_9EC590D4BB591BAA8D0EE8BDE93D0140" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_9EC590D4BB591BAA8D0EE8BDE93D0140" xlink:to="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_9EC590D4BB591BAA8D0EE8BDE93D0140" xlink:type="arc"/>
<link:label id="lab_efoi_DebtInstrumentPrepaymentPremiumPercent_333FBFEC5003B5F13308E8BDE93DBA0E_terseLabel_en-US" xlink:label="lab_efoi_DebtInstrumentPrepaymentPremiumPercent_333FBFEC5003B5F13308E8BDE93DBA0E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Prepayment premium </link:label>
<link:label id="lab_efoi_DebtInstrumentPrepaymentPremiumPercent_333FBFEC5003B5F13308E8BDE93DBA0E_label_en-US" xlink:label="lab_efoi_DebtInstrumentPrepaymentPremiumPercent_333FBFEC5003B5F13308E8BDE93DBA0E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Prepayment Premium, Percent </link:label>
<link:label id="lab_efoi_DebtInstrumentPrepaymentPremiumPercent_333FBFEC5003B5F13308E8BDE93DBA0E_documentation_en-US" xlink:label="lab_efoi_DebtInstrumentPrepaymentPremiumPercent_333FBFEC5003B5F13308E8BDE93DBA0E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Prepayment Premium, Percent </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_DebtInstrumentPrepaymentPremiumPercent" xlink:label="loc_efoi_DebtInstrumentPrepaymentPremiumPercent_333FBFEC5003B5F13308E8BDE93DBA0E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_DebtInstrumentPrepaymentPremiumPercent_333FBFEC5003B5F13308E8BDE93DBA0E" xlink:to="lab_efoi_DebtInstrumentPrepaymentPremiumPercent_333FBFEC5003B5F13308E8BDE93DBA0E" xlink:type="arc"/>
<link:label id="lab_efoi_LineOfCreditFacilityAnnualFacilityFeePercent_16312F14EB244888594DE8BDE93D117D_terseLabel_en-US" xlink:label="lab_efoi_LineOfCreditFacilityAnnualFacilityFeePercent_16312F14EB244888594DE8BDE93D117D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit facility, annual facility fee percentage </link:label>
<link:label id="lab_efoi_LineOfCreditFacilityAnnualFacilityFeePercent_16312F14EB244888594DE8BDE93D117D_label_en-US" xlink:label="lab_efoi_LineOfCreditFacilityAnnualFacilityFeePercent_16312F14EB244888594DE8BDE93D117D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line Of Credit Facility, Annual Facility Fee, Percent </link:label>
<link:label id="lab_efoi_LineOfCreditFacilityAnnualFacilityFeePercent_16312F14EB244888594DE8BDE93D117D_documentation_en-US" xlink:label="lab_efoi_LineOfCreditFacilityAnnualFacilityFeePercent_16312F14EB244888594DE8BDE93D117D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Line Of Credit Facility, Annual Facility Fee, Percent </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_LineOfCreditFacilityAnnualFacilityFeePercent" xlink:label="loc_efoi_LineOfCreditFacilityAnnualFacilityFeePercent_16312F14EB244888594DE8BDE93D117D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_LineOfCreditFacilityAnnualFacilityFeePercent_16312F14EB244888594DE8BDE93D117D" xlink:to="lab_efoi_LineOfCreditFacilityAnnualFacilityFeePercent_16312F14EB244888594DE8BDE93D117D" xlink:type="arc"/>
<link:label id="lab_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_627B0918B5285BFD80F1E8BDE93D83C4_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_627B0918B5285BFD80F1E8BDE93D83C4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit facility, interest rate </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_627B0918B5285BFD80F1E8BDE93D83C4_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_627B0918B5285BFD80F1E8BDE93D83C4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Interest Rate During Period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityInterestRateDuringPeriod" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_627B0918B5285BFD80F1E8BDE93D83C4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_627B0918B5285BFD80F1E8BDE93D83C4" xlink:to="lab_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_627B0918B5285BFD80F1E8BDE93D83C4" xlink:type="arc"/>
<link:label id="lab_efoi_RighttoTerminateNoticeRequiredPeriodofTime_592149FBBC90EB057C82E8BDE93D601E_terseLabel_en-US" xlink:label="lab_efoi_RighttoTerminateNoticeRequiredPeriodofTime_592149FBBC90EB057C82E8BDE93D601E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Right to terminate, notice required, period of time </link:label>
<link:label id="lab_efoi_RighttoTerminateNoticeRequiredPeriodofTime_592149FBBC90EB057C82E8BDE93D601E_label_en-US" xlink:label="lab_efoi_RighttoTerminateNoticeRequiredPeriodofTime_592149FBBC90EB057C82E8BDE93D601E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Right to Terminate, Notice Required, Period of Time </link:label>
<link:label id="lab_efoi_RighttoTerminateNoticeRequiredPeriodofTime_592149FBBC90EB057C82E8BDE93D601E_documentation_en-US" xlink:label="lab_efoi_RighttoTerminateNoticeRequiredPeriodofTime_592149FBBC90EB057C82E8BDE93D601E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Right to Terminate, Notice Required, Period of Time </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RighttoTerminateNoticeRequiredPeriodofTime" xlink:label="loc_efoi_RighttoTerminateNoticeRequiredPeriodofTime_592149FBBC90EB057C82E8BDE93D601E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_RighttoTerminateNoticeRequiredPeriodofTime_592149FBBC90EB057C82E8BDE93D601E" xlink:to="lab_efoi_RighttoTerminateNoticeRequiredPeriodofTime_592149FBBC90EB057C82E8BDE93D601E" xlink:type="arc"/>
<link:label id="lab_efoi_RightToTerminateLiquidatedDamagesYearOnePercent_C39954D90EE86F08CDEEE8BDE93E2B31_terseLabel_en-US" xlink:label="lab_efoi_RightToTerminateLiquidatedDamagesYearOnePercent_C39954D90EE86F08CDEEE8BDE93E2B31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Right to terminate, liquidated damages, year one, percent </link:label>
<link:label id="lab_efoi_RightToTerminateLiquidatedDamagesYearOnePercent_C39954D90EE86F08CDEEE8BDE93E2B31_label_en-US" xlink:label="lab_efoi_RightToTerminateLiquidatedDamagesYearOnePercent_C39954D90EE86F08CDEEE8BDE93E2B31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Right To Terminate, Liquidated Damages, Year One, Percent </link:label>
<link:label id="lab_efoi_RightToTerminateLiquidatedDamagesYearOnePercent_C39954D90EE86F08CDEEE8BDE93E2B31_documentation_en-US" xlink:label="lab_efoi_RightToTerminateLiquidatedDamagesYearOnePercent_C39954D90EE86F08CDEEE8BDE93E2B31" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Right To Terminate, Liquidated Damages, Year One, Percent </link:label>
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<link:label id="lab_efoi_RightToTerminateLiquidatedDamagesYearTwoPercent_4D3D15E5F13C3437B7BEE8BDE93EAD96_terseLabel_en-US" xlink:label="lab_efoi_RightToTerminateLiquidatedDamagesYearTwoPercent_4D3D15E5F13C3437B7BEE8BDE93EAD96" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Right to terminate, liquidated damages, year two, percent </link:label>
<link:label id="lab_efoi_RightToTerminateLiquidatedDamagesYearTwoPercent_4D3D15E5F13C3437B7BEE8BDE93EAD96_label_en-US" xlink:label="lab_efoi_RightToTerminateLiquidatedDamagesYearTwoPercent_4D3D15E5F13C3437B7BEE8BDE93EAD96" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Right To Terminate, Liquidated Damages, Year Two, Percent </link:label>
<link:label id="lab_efoi_RightToTerminateLiquidatedDamagesYearTwoPercent_4D3D15E5F13C3437B7BEE8BDE93EAD96_documentation_en-US" xlink:label="lab_efoi_RightToTerminateLiquidatedDamagesYearTwoPercent_4D3D15E5F13C3437B7BEE8BDE93EAD96" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Right To Terminate, Liquidated Damages, Year Two, Percent </link:label>
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<link:label id="lab_efoi_RightToTerminateLiquidatedDamagesYearThreePercent_DF6E9DC3CBBC85A20E39E8BDE93E864F_terseLabel_en-US" xlink:label="lab_efoi_RightToTerminateLiquidatedDamagesYearThreePercent_DF6E9DC3CBBC85A20E39E8BDE93E864F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Right to terminate, liquidated damages, year three, percent </link:label>
<link:label id="lab_efoi_RightToTerminateLiquidatedDamagesYearThreePercent_DF6E9DC3CBBC85A20E39E8BDE93E864F_label_en-US" xlink:label="lab_efoi_RightToTerminateLiquidatedDamagesYearThreePercent_DF6E9DC3CBBC85A20E39E8BDE93E864F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Right To Terminate, Liquidated Damages, Year Three, Percent </link:label>
<link:label id="lab_efoi_RightToTerminateLiquidatedDamagesYearThreePercent_DF6E9DC3CBBC85A20E39E8BDE93E864F_documentation_en-US" xlink:label="lab_efoi_RightToTerminateLiquidatedDamagesYearThreePercent_DF6E9DC3CBBC85A20E39E8BDE93E864F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Right To Terminate, Liquidated Damages, Year Three, Percent </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RightToTerminateLiquidatedDamagesYearThreePercent" xlink:label="loc_efoi_RightToTerminateLiquidatedDamagesYearThreePercent_DF6E9DC3CBBC85A20E39E8BDE93E864F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LinesOfCreditCurrent_03ED78E35B097CC3347AE8BDE93E26DD_terseLabel_en-US" xlink:label="lab_us-gaap_LinesOfCreditCurrent_03ED78E35B097CC3347AE8BDE93E26DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit line borrowings </link:label>
<link:label id="lab_us-gaap_LinesOfCreditCurrent_03ED78E35B097CC3347AE8BDE93E26DD_label_en-US" xlink:label="lab_us-gaap_LinesOfCreditCurrent_03ED78E35B097CC3347AE8BDE93E26DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LinesOfCreditCurrent" xlink:label="loc_us-gaap_LinesOfCreditCurrent_03ED78E35B097CC3347AE8BDE93E26DD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LinesOfCreditCurrent_03ED78E35B097CC3347AE8BDE93E26DD" xlink:to="lab_us-gaap_LinesOfCreditCurrent_03ED78E35B097CC3347AE8BDE93E26DD" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_EAABA82E097F5237EE6EE8BDE93E6584_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_EAABA82E097F5237EE6EE8BDE93E6584" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Unamortized discount (premium) and issuance costs </link:label>
<link:label id="lab_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_EAABA82E097F5237EE6EE8BDE93E6584_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_EAABA82E097F5237EE6EE8BDE93E6584" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_EAABA82E097F5237EE6EE8BDE93E6584" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_EAABA82E097F5237EE6EE8BDE93E6584" xlink:to="lab_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_EAABA82E097F5237EE6EE8BDE93E6584" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt_C2C62200FCADDE7EA574E8BDE93FBD7C_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt_C2C62200FCADDE7EA574E8BDE93FBD7C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from issuance of subordinated convertible promissory notes </link:label>
<link:label id="lab_us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt_C2C62200FCADDE7EA574E8BDE93FBD7C_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt_C2C62200FCADDE7EA574E8BDE93FBD7C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Issuance of Subordinated Long-term Debt </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt_C2C62200FCADDE7EA574E8BDE93FBD7C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt_C2C62200FCADDE7EA574E8BDE93FBD7C" xlink:to="lab_us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt_C2C62200FCADDE7EA574E8BDE93FBD7C" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtConversionOriginalDebtInterestRateOfDebt_3A8973CE0B75149F57C4E8BDE93FE71B_terseLabel_en-US" xlink:label="lab_us-gaap_DebtConversionOriginalDebtInterestRateOfDebt_3A8973CE0B75149F57C4E8BDE93FE71B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Interest rate on convertible notes </link:label>
<link:label id="lab_us-gaap_DebtConversionOriginalDebtInterestRateOfDebt_3A8973CE0B75149F57C4E8BDE93FE71B_label_en-US" xlink:label="lab_us-gaap_DebtConversionOriginalDebtInterestRateOfDebt_3A8973CE0B75149F57C4E8BDE93FE71B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Conversion, Original Debt, Interest Rate of Debt </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtConversionOriginalDebtInterestRateOfDebt" xlink:label="loc_us-gaap_DebtConversionOriginalDebtInterestRateOfDebt_3A8973CE0B75149F57C4E8BDE93FE71B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtConversionOriginalDebtInterestRateOfDebt_3A8973CE0B75149F57C4E8BDE93FE71B" xlink:to="lab_us-gaap_DebtConversionOriginalDebtInterestRateOfDebt_3A8973CE0B75149F57C4E8BDE93FE71B" xlink:type="arc"/>
<link:label id="lab_us-gaap_InterestPayableCurrent_828266AD4212E17B7AE6E8BDE93FFC85_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPayableCurrent_828266AD4212E17B7AE6E8BDE93FFC85" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued interest </link:label>
<link:label id="lab_us-gaap_InterestPayableCurrent_828266AD4212E17B7AE6E8BDE93FFC85_label_en-US" xlink:label="lab_us-gaap_InterestPayableCurrent_828266AD4212E17B7AE6E8BDE93FFC85" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Payable, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestPayableCurrent" xlink:label="loc_us-gaap_InterestPayableCurrent_828266AD4212E17B7AE6E8BDE93FFC85" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestPayableCurrent_828266AD4212E17B7AE6E8BDE93FFC85" xlink:to="lab_us-gaap_InterestPayableCurrent_828266AD4212E17B7AE6E8BDE93FFC85" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtConversionConvertedInstrumentAmount1_9C282D4394D007501E88E8BDE93F794A_terseLabel_en-US" xlink:label="lab_us-gaap_DebtConversionConvertedInstrumentAmount1_9C282D4394D007501E88E8BDE93F794A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amount converted </link:label>
<link:label id="lab_us-gaap_DebtConversionConvertedInstrumentAmount1_9C282D4394D007501E88E8BDE93F794A_label_en-US" xlink:label="lab_us-gaap_DebtConversionConvertedInstrumentAmount1_9C282D4394D007501E88E8BDE93F794A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Conversion, Converted Instrument, Amount </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtConversionConvertedInstrumentAmount1" xlink:label="loc_us-gaap_DebtConversionConvertedInstrumentAmount1_9C282D4394D007501E88E8BDE93F794A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtConversionConvertedInstrumentSharesIssued1_E42301BCAE3ED62B0972E8BDE93F2FAE_terseLabel_en-US" xlink:label="lab_us-gaap_DebtConversionConvertedInstrumentSharesIssued1_E42301BCAE3ED62B0972E8BDE93F2FAE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Shares issued from conversion (in shares) </link:label>
<link:label id="lab_us-gaap_DebtConversionConvertedInstrumentSharesIssued1_E42301BCAE3ED62B0972E8BDE93F2FAE_label_en-US" xlink:label="lab_us-gaap_DebtConversionConvertedInstrumentSharesIssued1_E42301BCAE3ED62B0972E8BDE93F2FAE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Conversion, Converted Instrument, Shares Issued </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtConversionConvertedInstrumentSharesIssued1" xlink:label="loc_us-gaap_DebtConversionConvertedInstrumentSharesIssued1_E42301BCAE3ED62B0972E8BDE93F2FAE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtConversionConvertedInstrumentSharesIssued1_E42301BCAE3ED62B0972E8BDE93F2FAE" xlink:to="lab_us-gaap_DebtConversionConvertedInstrumentSharesIssued1_E42301BCAE3ED62B0972E8BDE93F2FAE" xlink:type="arc"/>
<link:label id="lab_us-gaap_PreferredStockParOrStatedValuePerShare_CB9EAE2F02ED01B6A4A3E8BDE93FCA87_terseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockParOrStatedValuePerShare_CB9EAE2F02ED01B6A4A3E8BDE93FCA87" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Preferred stock, par value (in dollars per share) </link:label>
<link:label id="lab_us-gaap_PreferredStockParOrStatedValuePerShare_CB9EAE2F02ED01B6A4A3E8BDE93FCA87_label_en-US" xlink:label="lab_us-gaap_PreferredStockParOrStatedValuePerShare_CB9EAE2F02ED01B6A4A3E8BDE93FCA87" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Preferred Stock, Par or Stated Value Per Share </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_CB9EAE2F02ED01B6A4A3E8BDE93FCA87" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtInstrumentConvertibleConversionPrice1_7170D022379C2BF890B7E8BDE93F671B_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleConversionPrice1_7170D022379C2BF890B7E8BDE93F671B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Conversion price (in dollars per share) </link:label>
<link:label id="lab_us-gaap_DebtInstrumentConvertibleConversionPrice1_7170D022379C2BF890B7E8BDE93F671B_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleConversionPrice1_7170D022379C2BF890B7E8BDE93F671B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Convertible, Conversion Price </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_7170D022379C2BF890B7E8BDE93F671B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PreferredStockSharesAuthorized_4A712B6F89371FC02CEBE8BDE940BBDC_terseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockSharesAuthorized_4A712B6F89371FC02CEBE8BDE940BBDC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Preferred stock, shares authorized (in shares) </link:label>
<link:label id="lab_us-gaap_PreferredStockSharesAuthorized_4A712B6F89371FC02CEBE8BDE940BBDC_label_en-US" xlink:label="lab_us-gaap_PreferredStockSharesAuthorized_4A712B6F89371FC02CEBE8BDE940BBDC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Preferred Stock, Shares Authorized </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_4A712B6F89371FC02CEBE8BDE940BBDC" xlink:type="locator"/>
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<link:label id="lab_efoi_PreferredStockAdditionalSharesAuthorized_2EDE5760EB8C46C77CC4E8BDE940E907_terseLabel_en-US" xlink:label="lab_efoi_PreferredStockAdditionalSharesAuthorized_2EDE5760EB8C46C77CC4E8BDE940E907" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Preferred stock, additional shares authorized (in shares) </link:label>
<link:label id="lab_efoi_PreferredStockAdditionalSharesAuthorized_2EDE5760EB8C46C77CC4E8BDE940E907_label_en-US" xlink:label="lab_efoi_PreferredStockAdditionalSharesAuthorized_2EDE5760EB8C46C77CC4E8BDE940E907" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Preferred Stock, Additional Shares Authorized </link:label>
<link:label id="lab_efoi_PreferredStockAdditionalSharesAuthorized_2EDE5760EB8C46C77CC4E8BDE940E907_documentation_en-US" xlink:label="lab_efoi_PreferredStockAdditionalSharesAuthorized_2EDE5760EB8C46C77CC4E8BDE940E907" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Preferred Stock, Additional Shares Authorized </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_PreferredStockAdditionalSharesAuthorized" xlink:label="loc_efoi_PreferredStockAdditionalSharesAuthorized_2EDE5760EB8C46C77CC4E8BDE940E907" xlink:type="locator"/>
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<link:label id="lab_efoi_PreferredStockNumberOfVotesOfCommonStockPercent_38D45EA3DC91F6886CD3E8BDE9407B5D_terseLabel_en-US" xlink:label="lab_efoi_PreferredStockNumberOfVotesOfCommonStockPercent_38D45EA3DC91F6886CD3E8BDE9407B5D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Percent of votes of common stock </link:label>
<link:label id="lab_efoi_PreferredStockNumberOfVotesOfCommonStockPercent_38D45EA3DC91F6886CD3E8BDE9407B5D_label_en-US" xlink:label="lab_efoi_PreferredStockNumberOfVotesOfCommonStockPercent_38D45EA3DC91F6886CD3E8BDE9407B5D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Preferred Stock, Number Of Votes Of Common Stock, Percent </link:label>
<link:label id="lab_efoi_PreferredStockNumberOfVotesOfCommonStockPercent_38D45EA3DC91F6886CD3E8BDE9407B5D_documentation_en-US" xlink:label="lab_efoi_PreferredStockNumberOfVotesOfCommonStockPercent_38D45EA3DC91F6886CD3E8BDE9407B5D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Preferred Stock, Number Of Votes Of Common Stock, Percent </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_PreferredStockNumberOfVotesOfCommonStockPercent" xlink:label="loc_efoi_PreferredStockNumberOfVotesOfCommonStockPercent_38D45EA3DC91F6886CD3E8BDE9407B5D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_PreferredStockNumberOfVotesOfCommonStockPercent_38D45EA3DC91F6886CD3E8BDE9407B5D" xlink:to="lab_efoi_PreferredStockNumberOfVotesOfCommonStockPercent_38D45EA3DC91F6886CD3E8BDE9407B5D" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentFaceAmount_C69AEC7815B5EB2E7477E8BDE940CBD2_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_C69AEC7815B5EB2E7477E8BDE940CBD2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Principal amount </link:label>
<link:label id="lab_us-gaap_DebtInstrumentFaceAmount_C69AEC7815B5EB2E7477E8BDE940CBD2_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_C69AEC7815B5EB2E7477E8BDE940CBD2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Face Amount </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_C69AEC7815B5EB2E7477E8BDE940CBD2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFaceAmount_C69AEC7815B5EB2E7477E8BDE940CBD2" xlink:to="lab_us-gaap_DebtInstrumentFaceAmount_C69AEC7815B5EB2E7477E8BDE940CBD2" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentUnamortizedDiscount_712772486BD444BBCD1AE8BDE94094EF_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnamortizedDiscount_712772486BD444BBCD1AE8BDE94094EF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Original issue discount </link:label>
<link:label id="lab_us-gaap_DebtInstrumentUnamortizedDiscount_712772486BD444BBCD1AE8BDE94094EF_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnamortizedDiscount_712772486BD444BBCD1AE8BDE94094EF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Unamortized Discount </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscount" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_712772486BD444BBCD1AE8BDE94094EF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentUnamortizedDiscount_712772486BD444BBCD1AE8BDE94094EF" xlink:to="lab_us-gaap_DebtInstrumentUnamortizedDiscount_712772486BD444BBCD1AE8BDE94094EF" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromIssuanceOfDebt_7A4BDF071482B83E9679E8BDE94044BB_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfDebt_7A4BDF071482B83E9679E8BDE94044BB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from issuance </link:label>
<link:label id="lab_us-gaap_ProceedsFromIssuanceOfDebt_7A4BDF071482B83E9679E8BDE94044BB_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfDebt_7A4BDF071482B83E9679E8BDE94044BB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Issuance of Debt </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceOfDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_7A4BDF071482B83E9679E8BDE94044BB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromIssuanceOfDebt_7A4BDF071482B83E9679E8BDE94044BB" xlink:to="lab_us-gaap_ProceedsFromIssuanceOfDebt_7A4BDF071482B83E9679E8BDE94044BB" xlink:type="arc"/>
<link:label id="lab_us-gaap_DeferredFinanceCostsGross_FB64255E0514CFC280E7E8BDE941AA45_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsGross_FB64255E0514CFC280E7E8BDE941AA45" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt issuance costs </link:label>
<link:label id="lab_us-gaap_DeferredFinanceCostsGross_FB64255E0514CFC280E7E8BDE941AA45_label_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsGross_FB64255E0514CFC280E7E8BDE941AA45" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Issuance Costs, Gross </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredFinanceCostsGross" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_FB64255E0514CFC280E7E8BDE941AA45" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredFinanceCostsGross_FB64255E0514CFC280E7E8BDE941AA45" xlink:to="lab_us-gaap_DeferredFinanceCostsGross_FB64255E0514CFC280E7E8BDE941AA45" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentRepurchaseAmount_1A1E24EAF5E5A2B6B1D2E8BDE941816A_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRepurchaseAmount_1A1E24EAF5E5A2B6B1D2E8BDE941816A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Redemption amount </link:label>
<link:label id="lab_us-gaap_DebtInstrumentRepurchaseAmount_1A1E24EAF5E5A2B6B1D2E8BDE941816A_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRepurchaseAmount_1A1E24EAF5E5A2B6B1D2E8BDE941816A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Repurchase Amount </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRepurchaseAmount" xlink:label="loc_us-gaap_DebtInstrumentRepurchaseAmount_1A1E24EAF5E5A2B6B1D2E8BDE941816A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRepurchaseAmount_1A1E24EAF5E5A2B6B1D2E8BDE941816A" xlink:to="lab_us-gaap_DebtInstrumentRepurchaseAmount_1A1E24EAF5E5A2B6B1D2E8BDE941816A" xlink:type="arc"/>
<link:label id="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromBecomingDelistedPercent_040506A003805E97B5F4E8BDE9419C67_terseLabel_en-US" xlink:label="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromBecomingDelistedPercent_040506A003805E97B5F4E8BDE9419C67" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Percent increase in amount outstanding from becoming delisted </link:label>
<link:label id="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromBecomingDelistedPercent_040506A003805E97B5F4E8BDE9419C67_label_en-US" xlink:label="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromBecomingDelistedPercent_040506A003805E97B5F4E8BDE9419C67" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Increase In Amount Outstanding From Becoming Delisted, Percent </link:label>
<link:label id="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromBecomingDelistedPercent_040506A003805E97B5F4E8BDE9419C67_documentation_en-US" xlink:label="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromBecomingDelistedPercent_040506A003805E97B5F4E8BDE9419C67" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Increase In Amount Outstanding From Becoming Delisted, Percent </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_DebtInstrumentIncreaseInAmountOutstandingFromBecomingDelistedPercent" xlink:label="loc_efoi_DebtInstrumentIncreaseInAmountOutstandingFromBecomingDelistedPercent_040506A003805E97B5F4E8BDE9419C67" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_DebtInstrumentIncreaseInAmountOutstandingFromBecomingDelistedPercent_040506A003805E97B5F4E8BDE9419C67" xlink:to="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromBecomingDelistedPercent_040506A003805E97B5F4E8BDE9419C67" xlink:type="arc"/>
<link:label id="lab_efoi_DebtInstrumentProceedsToBePaidToLenderPercent_3A9DB8B2AE56250F39E3E8BDE941E56B_terseLabel_en-US" xlink:label="lab_efoi_DebtInstrumentProceedsToBePaidToLenderPercent_3A9DB8B2AE56250F39E3E8BDE941E56B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Percent proceeds to be paid to Lender </link:label>
<link:label id="lab_efoi_DebtInstrumentProceedsToBePaidToLenderPercent_3A9DB8B2AE56250F39E3E8BDE941E56B_label_en-US" xlink:label="lab_efoi_DebtInstrumentProceedsToBePaidToLenderPercent_3A9DB8B2AE56250F39E3E8BDE941E56B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Proceeds To Be Paid To Lender, Percent </link:label>
<link:label id="lab_efoi_DebtInstrumentProceedsToBePaidToLenderPercent_3A9DB8B2AE56250F39E3E8BDE941E56B_documentation_en-US" xlink:label="lab_efoi_DebtInstrumentProceedsToBePaidToLenderPercent_3A9DB8B2AE56250F39E3E8BDE941E56B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Proceeds To Be Paid To Lender, Percent </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_DebtInstrumentProceedsToBePaidToLenderPercent" xlink:label="loc_efoi_DebtInstrumentProceedsToBePaidToLenderPercent_3A9DB8B2AE56250F39E3E8BDE941E56B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_DebtInstrumentProceedsToBePaidToLenderPercent_3A9DB8B2AE56250F39E3E8BDE941E56B" xlink:to="lab_efoi_DebtInstrumentProceedsToBePaidToLenderPercent_3A9DB8B2AE56250F39E3E8BDE941E56B" xlink:type="arc"/>
<link:label id="lab_efoi_DebtInstrumentIncreaseFromExercisesOfRestrictedIssuancePercent_1ECF856EBBE7383CD050E8BDE94106FF_terseLabel_en-US" xlink:label="lab_efoi_DebtInstrumentIncreaseFromExercisesOfRestrictedIssuancePercent_1ECF856EBBE7383CD050E8BDE94106FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Percent increase from exercise of Restricted Issuance </link:label>
<link:label id="lab_efoi_DebtInstrumentIncreaseFromExercisesOfRestrictedIssuancePercent_1ECF856EBBE7383CD050E8BDE94106FF_label_en-US" xlink:label="lab_efoi_DebtInstrumentIncreaseFromExercisesOfRestrictedIssuancePercent_1ECF856EBBE7383CD050E8BDE94106FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Increase From Exercises Of Restricted Issuance, Percent </link:label>
<link:label id="lab_efoi_DebtInstrumentIncreaseFromExercisesOfRestrictedIssuancePercent_1ECF856EBBE7383CD050E8BDE94106FF_documentation_en-US" xlink:label="lab_efoi_DebtInstrumentIncreaseFromExercisesOfRestrictedIssuancePercent_1ECF856EBBE7383CD050E8BDE94106FF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Increase From Exercises Of Restricted Issuance, Percent </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_DebtInstrumentIncreaseFromExercisesOfRestrictedIssuancePercent" xlink:label="loc_efoi_DebtInstrumentIncreaseFromExercisesOfRestrictedIssuancePercent_1ECF856EBBE7383CD050E8BDE94106FF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_DebtInstrumentIncreaseFromExercisesOfRestrictedIssuancePercent_1ECF856EBBE7383CD050E8BDE94106FF" xlink:to="lab_efoi_DebtInstrumentIncreaseFromExercisesOfRestrictedIssuancePercent_1ECF856EBBE7383CD050E8BDE94106FF" xlink:type="arc"/>
<link:label id="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromDefaultEventPercent_023362FCC9284ABF8D10E8BDE94193EF_terseLabel_en-US" xlink:label="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromDefaultEventPercent_023362FCC9284ABF8D10E8BDE94193EF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Percent increase in amount outstanding from default event </link:label>
<link:label id="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromDefaultEventPercent_023362FCC9284ABF8D10E8BDE94193EF_label_en-US" xlink:label="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromDefaultEventPercent_023362FCC9284ABF8D10E8BDE94193EF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Increase In Amount Outstanding From Default Event, Percent </link:label>
<link:label id="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromDefaultEventPercent_023362FCC9284ABF8D10E8BDE94193EF_documentation_en-US" xlink:label="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromDefaultEventPercent_023362FCC9284ABF8D10E8BDE94193EF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Increase In Amount Outstanding From Default Event, Percent </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_DebtInstrumentIncreaseInAmountOutstandingFromDefaultEventPercent" xlink:label="loc_efoi_DebtInstrumentIncreaseInAmountOutstandingFromDefaultEventPercent_023362FCC9284ABF8D10E8BDE94193EF" xlink:type="locator"/>
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<link:label id="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromInsolvencyAndBankruptcyEventPercent_F1BC909C822293DC002AE8BDE9422C4F_terseLabel_en-US" xlink:label="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromInsolvencyAndBankruptcyEventPercent_F1BC909C822293DC002AE8BDE9422C4F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Percent increase in amount outstanding from insolvency and bankruptcy event </link:label>
<link:label id="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromInsolvencyAndBankruptcyEventPercent_F1BC909C822293DC002AE8BDE9422C4F_label_en-US" xlink:label="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromInsolvencyAndBankruptcyEventPercent_F1BC909C822293DC002AE8BDE9422C4F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Increase In Amount Outstanding From Insolvency And Bankruptcy Event, Percent </link:label>
<link:label id="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromInsolvencyAndBankruptcyEventPercent_F1BC909C822293DC002AE8BDE9422C4F_documentation_en-US" xlink:label="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromInsolvencyAndBankruptcyEventPercent_F1BC909C822293DC002AE8BDE9422C4F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Increase In Amount Outstanding From Insolvency And Bankruptcy Event, Percent </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_DebtInstrumentIncreaseInAmountOutstandingFromInsolvencyAndBankruptcyEventPercent" xlink:label="loc_efoi_DebtInstrumentIncreaseInAmountOutstandingFromInsolvencyAndBankruptcyEventPercent_F1BC909C822293DC002AE8BDE9422C4F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_DebtInstrumentIncreaseInAmountOutstandingFromInsolvencyAndBankruptcyEventPercent_F1BC909C822293DC002AE8BDE9422C4F" xlink:to="lab_efoi_DebtInstrumentIncreaseInAmountOutstandingFromInsolvencyAndBankruptcyEventPercent_F1BC909C822293DC002AE8BDE9422C4F" xlink:type="arc"/>
<link:label id="lab_efoi_DebtInstrumentInterestRateAfterInsolvencyAndBankruptcyEventsPercent_793F6E3DD2BCAE7F3B79E8BDE942B879_terseLabel_en-US" xlink:label="lab_efoi_DebtInstrumentInterestRateAfterInsolvencyAndBankruptcyEventsPercent_793F6E3DD2BCAE7F3B79E8BDE942B879" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Percent interest accrued after events </link:label>
<link:label id="lab_efoi_DebtInstrumentInterestRateAfterInsolvencyAndBankruptcyEventsPercent_793F6E3DD2BCAE7F3B79E8BDE942B879_label_en-US" xlink:label="lab_efoi_DebtInstrumentInterestRateAfterInsolvencyAndBankruptcyEventsPercent_793F6E3DD2BCAE7F3B79E8BDE942B879" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Interest Rate After Insolvency And Bankruptcy Events, Percent </link:label>
<link:label id="lab_efoi_DebtInstrumentInterestRateAfterInsolvencyAndBankruptcyEventsPercent_793F6E3DD2BCAE7F3B79E8BDE942B879_documentation_en-US" xlink:label="lab_efoi_DebtInstrumentInterestRateAfterInsolvencyAndBankruptcyEventsPercent_793F6E3DD2BCAE7F3B79E8BDE942B879" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Interest Rate After Insolvency And Bankruptcy Events, Percent </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_DebtInstrumentInterestRateAfterInsolvencyAndBankruptcyEventsPercent" xlink:label="loc_efoi_DebtInstrumentInterestRateAfterInsolvencyAndBankruptcyEventsPercent_793F6E3DD2BCAE7F3B79E8BDE942B879" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_2D9A7263742FDBA21DA9E8BDE942FD19_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_2D9A7263742FDBA21DA9E8BDE942FD19" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total liability </link:label>
<link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_2D9A7263742FDBA21DA9E8BDE942FD19_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_2D9A7263742FDBA21DA9E8BDE942FD19" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Gross </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_2D9A7263742FDBA21DA9E8BDE942FD19" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_8024D7EC7C704F20D6EFC5462FE25B89_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_8024D7EC7C704F20D6EFC5462FE25B89" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity </link:label>
<link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_8024D7EC7C704F20D6EFC5462FE25B89_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_8024D7EC7C704F20D6EFC5462FE25B89" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity Note Disclosure [Text Block] </link:label>
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<link:label id="lab_us-gaap_IncomeStatementAbstract_A1F2F3794CF60855D1D6E460CE06AB4B_label_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract_A1F2F3794CF60855D1D6E460CE06AB4B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Statement [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaap_IncomeStatementAbstract_A1F2F3794CF60855D1D6E460CE06AB4B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_Revenues_D4F7BD78BB32C4DCD4E1E460CE0664D3_terseLabel_en-US" xlink:label="lab_us-gaap_Revenues_D4F7BD78BB32C4DCD4E1E460CE0664D3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net sales </link:label>
<link:label id="lab_us-gaap_Revenues_D4F7BD78BB32C4DCD4E1E460CE0664D3_label_en-US" xlink:label="lab_us-gaap_Revenues_D4F7BD78BB32C4DCD4E1E460CE0664D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenues </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_D4F7BD78BB32C4DCD4E1E460CE0664D3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Revenues_D4F7BD78BB32C4DCD4E1E460CE0664D3" xlink:to="lab_us-gaap_Revenues_D4F7BD78BB32C4DCD4E1E460CE0664D3" xlink:type="arc"/>
<link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_08802C4AF0468AB1454CE460CE07B8B1_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_08802C4AF0468AB1454CE460CE07B8B1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cost of sales </link:label>
<link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_08802C4AF0468AB1454CE460CE07B8B1_label_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_08802C4AF0468AB1454CE460CE07B8B1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost of Goods and Services Sold </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_08802C4AF0468AB1454CE460CE07B8B1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GrossProfit_0F22531648F1C37CE6EEE460CE07AA26_totalLabel_en-US" xlink:label="lab_us-gaap_GrossProfit_0F22531648F1C37CE6EEE460CE07AA26" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Gross profit </link:label>
<link:label id="lab_us-gaap_GrossProfit_0F22531648F1C37CE6EEE460CE07AA26_label_en-US" xlink:label="lab_us-gaap_GrossProfit_0F22531648F1C37CE6EEE460CE07AA26" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gross Profit </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_0F22531648F1C37CE6EEE460CE07AA26" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingExpensesAbstract_613DE724232B33C7B213E460CE072A04_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_613DE724232B33C7B213E460CE072A04" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating expenses: </link:label>
<link:label id="lab_us-gaap_OperatingExpensesAbstract_613DE724232B33C7B213E460CE072A04_label_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_613DE724232B33C7B213E460CE072A04" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Expenses [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_613DE724232B33C7B213E460CE072A04" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingExpensesAbstract_613DE724232B33C7B213E460CE072A04" xlink:to="lab_us-gaap_OperatingExpensesAbstract_613DE724232B33C7B213E460CE072A04" xlink:type="arc"/>
<link:label id="lab_us-gaap_ResearchAndDevelopmentExpense_92C4C823994B1B48D2D3E460CE077393_terseLabel_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpense_92C4C823994B1B48D2D3E460CE077393" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Product development </link:label>
<link:label id="lab_us-gaap_ResearchAndDevelopmentExpense_92C4C823994B1B48D2D3E460CE077393_label_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpense_92C4C823994B1B48D2D3E460CE077393" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Research and Development Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_92C4C823994B1B48D2D3E460CE077393" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpense_75DDF945D8F36B7D84B0E460CE077B90_terseLabel_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpense_75DDF945D8F36B7D84B0E460CE077B90" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Selling, general, and administrative </link:label>
<link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpense_75DDF945D8F36B7D84B0E460CE077B90_label_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpense_75DDF945D8F36B7D84B0E460CE077B90" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Selling, General and Administrative Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_75DDF945D8F36B7D84B0E460CE077B90" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AssetImpairmentCharges_2036E60933D4FF69F5C0E460CE078700_terseLabel_en-US" xlink:label="lab_us-gaap_AssetImpairmentCharges_2036E60933D4FF69F5C0E460CE078700" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Loss on impairment </link:label>
<link:label id="lab_us-gaap_AssetImpairmentCharges_2036E60933D4FF69F5C0E460CE078700_label_en-US" xlink:label="lab_us-gaap_AssetImpairmentCharges_2036E60933D4FF69F5C0E460CE078700" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Asset Impairment Charges </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetImpairmentCharges" xlink:label="loc_us-gaap_AssetImpairmentCharges_2036E60933D4FF69F5C0E460CE078700" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetImpairmentCharges_2036E60933D4FF69F5C0E460CE078700" xlink:to="lab_us-gaap_AssetImpairmentCharges_2036E60933D4FF69F5C0E460CE078700" xlink:type="arc"/>
<link:label id="lab_us-gaap_RestructuringCosts_8A763728DED7D991C19AE460CE083C2A_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringCosts_8A763728DED7D991C19AE460CE083C2A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restructuring </link:label>
<link:label id="lab_us-gaap_RestructuringCosts_8A763728DED7D991C19AE460CE083C2A_label_en-US" xlink:label="lab_us-gaap_RestructuringCosts_8A763728DED7D991C19AE460CE083C2A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructuring Costs </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCosts" xlink:label="loc_us-gaap_RestructuringCosts_8A763728DED7D991C19AE460CE083C2A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingExpenses_33B04036C0F74F2541B4E460CE08B6F9_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingExpenses_33B04036C0F74F2541B4E460CE08B6F9" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total operating expenses </link:label>
<link:label id="lab_us-gaap_OperatingExpenses_33B04036C0F74F2541B4E460CE08B6F9_label_en-US" xlink:label="lab_us-gaap_OperatingExpenses_33B04036C0F74F2541B4E460CE08B6F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Expenses </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_33B04036C0F74F2541B4E460CE08B6F9" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingIncomeLoss_253A809078280D139C74E460CE088415_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_253A809078280D139C74E460CE088415" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Loss from operations </link:label>
<link:label id="lab_us-gaap_OperatingIncomeLoss_253A809078280D139C74E460CE088415_label_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_253A809078280D139C74E460CE088415" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Income (Loss) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_253A809078280D139C74E460CE088415" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NonoperatingIncomeExpenseAbstract_2AA19F57000CAAD99370E460CE08E964_terseLabel_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpenseAbstract_2AA19F57000CAAD99370E460CE08E964" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other expenses: </link:label>
<link:label id="lab_us-gaap_NonoperatingIncomeExpenseAbstract_2AA19F57000CAAD99370E460CE08E964_label_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpenseAbstract_2AA19F57000CAAD99370E460CE08E964" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Nonoperating Income (Expense) [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_2AA19F57000CAAD99370E460CE08E964" xlink:type="locator"/>
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<link:label id="lab_us-gaap_InterestExpense_7689F6E4DE789DA12529E460CE08E36B_terseLabel_en-US" xlink:label="lab_us-gaap_InterestExpense_7689F6E4DE789DA12529E460CE08E36B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Interest expense </link:label>
<link:label id="lab_us-gaap_InterestExpense_7689F6E4DE789DA12529E460CE08E36B_label_en-US" xlink:label="lab_us-gaap_InterestExpense_7689F6E4DE789DA12529E460CE08E36B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_7689F6E4DE789DA12529E460CE08E36B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherNonoperatingIncomeExpense_3D82B62D84DBE8A50625E460CE0849F4_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_OtherNonoperatingIncomeExpense_3D82B62D84DBE8A50625E460CE0849F4" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Other expenses </link:label>
<link:label id="lab_us-gaap_OtherNonoperatingIncomeExpense_3D82B62D84DBE8A50625E460CE0849F4_label_en-US" xlink:label="lab_us-gaap_OtherNonoperatingIncomeExpense_3D82B62D84DBE8A50625E460CE0849F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Nonoperating Income (Expense) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_3D82B62D84DBE8A50625E460CE0849F4" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_AE6BD0B2FE9324609EACE460CE098BC6_totalLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_AE6BD0B2FE9324609EACE460CE098BC6" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Loss from operations before income taxes </link:label>
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<link:label id="lab_us-gaap_OtherPrepaidExpenseCurrent_68A2ADE43D8381912B7DC5830955B977_terseLabel_en-US" xlink:label="lab_us-gaap_OtherPrepaidExpenseCurrent_68A2ADE43D8381912B7DC5830955B977" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Prepaid expenses </link:label>
<link:label id="lab_us-gaap_OtherPrepaidExpenseCurrent_68A2ADE43D8381912B7DC5830955B977_label_en-US" xlink:label="lab_us-gaap_OtherPrepaidExpenseCurrent_68A2ADE43D8381912B7DC5830955B977" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Prepaid Expense, Current </link:label>
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<link:label id="lab_us-gaap_DeferredFinanceCostsCurrentNet_81E19C28A4C854000952C58309555BF3_label_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsCurrentNet_81E19C28A4C854000952C58309555BF3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Issuance Costs, Current, Net </link:label>
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<link:label id="lab_us-gaap_EarningsPerShareBasicAndDiluted_2A3F7CA24BCF4F006854CB909D7D4BC5_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAndDiluted_2A3F7CA24BCF4F006854CB909D7D4BC5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net loss per share (basic and diluted) (in dollars per share) </link:label>
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<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareBasicAndDiluted_2A3F7CA24BCF4F006854CB909D7D4BC5" xlink:to="lab_us-gaap_EarningsPerShareBasicAndDiluted_2A3F7CA24BCF4F006854CB909D7D4BC5" xlink:type="arc"/>
<link:label id="lab_us-gaap_MovementInStandardProductWarrantyAccrualRollForward_A88075A8A9887A8D5F7EC54630E3046A_terseLabel_en-US" xlink:label="lab_us-gaap_MovementInStandardProductWarrantyAccrualRollForward_A88075A8A9887A8D5F7EC54630E3046A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Movement in Standard Product Warranty Accrual [Roll Forward] </link:label>
<link:label id="lab_us-gaap_MovementInStandardProductWarrantyAccrualRollForward_A88075A8A9887A8D5F7EC54630E3046A_label_en-US" xlink:label="lab_us-gaap_MovementInStandardProductWarrantyAccrualRollForward_A88075A8A9887A8D5F7EC54630E3046A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Movement in Standard Product Warranty Accrual [Roll Forward] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MovementInStandardProductWarrantyAccrualRollForward" xlink:label="loc_us-gaap_MovementInStandardProductWarrantyAccrualRollForward_A88075A8A9887A8D5F7EC54630E3046A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MovementInStandardProductWarrantyAccrualRollForward_A88075A8A9887A8D5F7EC54630E3046A" xlink:to="lab_us-gaap_MovementInStandardProductWarrantyAccrualRollForward_A88075A8A9887A8D5F7EC54630E3046A" xlink:type="arc"/>
<link:label id="lab_us-gaap_StandardProductWarrantyAccrualCurrent_5020304498B03EE5238CC54630E3CFE5_periodStartLabel_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyAccrualCurrent_5020304498B03EE5238CC54630E3CFE5" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Balance at the beginning of the year </link:label>
<link:label id="lab_us-gaap_StandardProductWarrantyAccrualCurrent_5020304498B03EE5238CC54630E3CFE5_label_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyAccrualCurrent_5020304498B03EE5238CC54630E3CFE5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Standard Product Warranty Accrual, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StandardProductWarrantyAccrualCurrent" xlink:label="loc_us-gaap_StandardProductWarrantyAccrualCurrent_5020304498B03EE5238CC54630E3CFE5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StandardProductWarrantyAccrualCurrent_5020304498B03EE5238CC54630E3CFE5" xlink:to="lab_us-gaap_StandardProductWarrantyAccrualCurrent_5020304498B03EE5238CC54630E3CFE5" xlink:type="arc"/>
<link:label id="lab_us-gaap_StandardProductWarrantyAccrualWarrantiesIssued_1F526A216D540D5357EDC54630E32AA3_terseLabel_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyAccrualWarrantiesIssued_1F526A216D540D5357EDC54630E32AA3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accruals for warranties issued </link:label>
<link:label id="lab_us-gaap_StandardProductWarrantyAccrualWarrantiesIssued_1F526A216D540D5357EDC54630E32AA3_label_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyAccrualWarrantiesIssued_1F526A216D540D5357EDC54630E32AA3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Standard Product Warranty Accrual, Increase for Warranties Issued </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StandardProductWarrantyAccrualWarrantiesIssued" xlink:label="loc_us-gaap_StandardProductWarrantyAccrualWarrantiesIssued_1F526A216D540D5357EDC54630E32AA3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StandardProductWarrantyAccrualWarrantiesIssued_1F526A216D540D5357EDC54630E32AA3" xlink:to="lab_us-gaap_StandardProductWarrantyAccrualWarrantiesIssued_1F526A216D540D5357EDC54630E32AA3" xlink:type="arc"/>
<link:label id="lab_us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease_EF4AA8C13C7CE85A32BAC54630E35427_terseLabel_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease_EF4AA8C13C7CE85A32BAC54630E35427" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Adjustments to existing warranties </link:label>
<link:label id="lab_us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease_EF4AA8C13C7CE85A32BAC54630E35427_label_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease_EF4AA8C13C7CE85A32BAC54630E35427" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Standard Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease" xlink:label="loc_us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease_EF4AA8C13C7CE85A32BAC54630E35427" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease_EF4AA8C13C7CE85A32BAC54630E35427" xlink:to="lab_us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease_EF4AA8C13C7CE85A32BAC54630E35427" xlink:type="arc"/>
<link:label id="lab_us-gaap_StandardProductWarrantyAccrualPayments_F7332482DD42EBFBE8A5C54630E3073D_negatedLabel_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyAccrualPayments_F7332482DD42EBFBE8A5C54630E3073D" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Settlements made during the year (in kind) </link:label>
<link:label id="lab_us-gaap_StandardProductWarrantyAccrualPayments_F7332482DD42EBFBE8A5C54630E3073D_label_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyAccrualPayments_F7332482DD42EBFBE8A5C54630E3073D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Standard Product Warranty Accrual, Decrease for Payments </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StandardProductWarrantyAccrualPayments" xlink:label="loc_us-gaap_StandardProductWarrantyAccrualPayments_F7332482DD42EBFBE8A5C54630E3073D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StandardProductWarrantyAccrualPayments_F7332482DD42EBFBE8A5C54630E3073D" xlink:to="lab_us-gaap_StandardProductWarrantyAccrualPayments_F7332482DD42EBFBE8A5C54630E3073D" xlink:type="arc"/>
<link:label id="lab_us-gaap_StandardProductWarrantyAccrualCurrent_868D9AB25436285D615EC54630E33FDC_periodEndLabel_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyAccrualCurrent_868D9AB25436285D615EC54630E33FDC" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Accrued warranty expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StandardProductWarrantyAccrualCurrent" xlink:label="loc_us-gaap_StandardProductWarrantyAccrualCurrent_868D9AB25436285D615EC54630E33FDC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StandardProductWarrantyAccrualCurrent_868D9AB25436285D615EC54630E33FDC" xlink:to="lab_us-gaap_StandardProductWarrantyAccrualCurrent_868D9AB25436285D615EC54630E33FDC" xlink:type="arc"/>
<link:label id="lab_us-gaap_PayablesAndAccrualsAbstract_7116EE780DEF79AF017BC583088082B7_label_en-US" xlink:label="lab_us-gaap_PayablesAndAccrualsAbstract_7116EE780DEF79AF017BC583088082B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payables and Accruals [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PayablesAndAccrualsAbstract" xlink:label="loc_us-gaap_PayablesAndAccrualsAbstract_7116EE780DEF79AF017BC583088082B7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_7D6B6260F14CFEB2CC11C5830880EBA9_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_7D6B6260F14CFEB2CC11C5830880EBA9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued Liabilities </link:label>
<link:label id="lab_us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_7D6B6260F14CFEB2CC11C5830880EBA9_label_en-US" xlink:label="lab_us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_7D6B6260F14CFEB2CC11C5830880EBA9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock" xlink:label="loc_us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_7D6B6260F14CFEB2CC11C5830880EBA9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_7D6B6260F14CFEB2CC11C5830880EBA9" xlink:to="lab_us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_7D6B6260F14CFEB2CC11C5830880EBA9" xlink:type="arc"/>
<link:label id="lab_us-gaap_LeasesAbstract_5707F92A716E26FCE0DFDE218498DBC9_label_en-US" xlink:label="lab_us-gaap_LeasesAbstract_5707F92A716E26FCE0DFDE218498DBC9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Leases [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_5707F92A716E26FCE0DFDE218498DBC9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeasesAbstract_5707F92A716E26FCE0DFDE218498DBC9" xlink:to="lab_us-gaap_LeasesAbstract_5707F92A716E26FCE0DFDE218498DBC9" xlink:type="arc"/>
<link:label id="lab_us-gaap_LeaseCostTableTextBlock_7BE2773766C1A84AA1E7DE2184994148_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_7BE2773766C1A84AA1E7DE2184994148" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Components of Lease Cost and Supplemental Cash Flow Information </link:label>
<link:label id="lab_us-gaap_LeaseCostTableTextBlock_7BE2773766C1A84AA1E7DE2184994148_label_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_7BE2773766C1A84AA1E7DE2184994148" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease, Cost [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseCostTableTextBlock" xlink:label="loc_us-gaap_LeaseCostTableTextBlock_7BE2773766C1A84AA1E7DE2184994148" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseCostTableTextBlock_7BE2773766C1A84AA1E7DE2184994148" xlink:to="lab_us-gaap_LeaseCostTableTextBlock_7BE2773766C1A84AA1E7DE2184994148" xlink:type="arc"/>
<link:label id="lab_efoi_LeaseSupplementalBalanceSheetInformationTableTextBlock_B4C2175EF822B64EF331DE218499AA25_terseLabel_en-US" xlink:label="lab_efoi_LeaseSupplementalBalanceSheetInformationTableTextBlock_B4C2175EF822B64EF331DE218499AA25" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Supplemental Balance Sheet Information </link:label>
<link:label id="lab_efoi_LeaseSupplementalBalanceSheetInformationTableTextBlock_B4C2175EF822B64EF331DE218499AA25_label_en-US" xlink:label="lab_efoi_LeaseSupplementalBalanceSheetInformationTableTextBlock_B4C2175EF822B64EF331DE218499AA25" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease, Supplemental Balance Sheet Information [Table Text Block] </link:label>
<link:label id="lab_efoi_LeaseSupplementalBalanceSheetInformationTableTextBlock_B4C2175EF822B64EF331DE218499AA25_documentation_en-US" xlink:label="lab_efoi_LeaseSupplementalBalanceSheetInformationTableTextBlock_B4C2175EF822B64EF331DE218499AA25" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lease, Supplemental Balance Sheet Information [Table Text Block] </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_LeaseSupplementalBalanceSheetInformationTableTextBlock" xlink:label="loc_efoi_LeaseSupplementalBalanceSheetInformationTableTextBlock_B4C2175EF822B64EF331DE218499AA25" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_LeaseSupplementalBalanceSheetInformationTableTextBlock_B4C2175EF822B64EF331DE218499AA25" xlink:to="lab_efoi_LeaseSupplementalBalanceSheetInformationTableTextBlock_B4C2175EF822B64EF331DE218499AA25" xlink:type="arc"/>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_BEB3B67F823BEC965C20DE218499EA01_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_BEB3B67F823BEC965C20DE218499EA01" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Future Maturities of Finance Lease Liabilities </link:label>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_BEB3B67F823BEC965C20DE218499EA01_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_BEB3B67F823BEC965C20DE218499EA01" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Maturity [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock" xlink:label="loc_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_BEB3B67F823BEC965C20DE218499EA01" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_BEB3B67F823BEC965C20DE218499EA01" xlink:to="lab_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_BEB3B67F823BEC965C20DE218499EA01" xlink:type="arc"/>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_FB329702959A07BEAA54DE21849B3C35_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_FB329702959A07BEAA54DE21849B3C35" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Future Maturities of Operating Lease Liabilities </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_FB329702959A07BEAA54DE21849B3C35_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_FB329702959A07BEAA54DE21849B3C35" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Maturity [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_FB329702959A07BEAA54DE21849B3C35" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_FB329702959A07BEAA54DE21849B3C35" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_FB329702959A07BEAA54DE21849B3C35" xlink:type="arc"/>
<link:label id="lab_efoi_SupplementalCashFlowInformationRelatedToLeasesTableTextBlock_414067DBEC2BA6CE1409DE3D4F1D67D8_terseLabel_en-US" xlink:label="lab_efoi_SupplementalCashFlowInformationRelatedToLeasesTableTextBlock_414067DBEC2BA6CE1409DE3D4F1D67D8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Supplemental Cash Flow Information Related To Leases [Table Text Block] </link:label>
<link:label id="lab_efoi_SupplementalCashFlowInformationRelatedToLeasesTableTextBlock_414067DBEC2BA6CE1409DE3D4F1D67D8_label_en-US" xlink:label="lab_efoi_SupplementalCashFlowInformationRelatedToLeasesTableTextBlock_414067DBEC2BA6CE1409DE3D4F1D67D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Supplemental Cash Flow Information Related To Leases [Table Text Block] </link:label>
<link:label id="lab_efoi_SupplementalCashFlowInformationRelatedToLeasesTableTextBlock_414067DBEC2BA6CE1409DE3D4F1D67D8_documentation_en-US" xlink:label="lab_efoi_SupplementalCashFlowInformationRelatedToLeasesTableTextBlock_414067DBEC2BA6CE1409DE3D4F1D67D8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> [Table Text Block] for Supplemental Cash Flow Information Related To Leases [Table] </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_SupplementalCashFlowInformationRelatedToLeasesTableTextBlock" xlink:label="loc_efoi_SupplementalCashFlowInformationRelatedToLeasesTableTextBlock_414067DBEC2BA6CE1409DE3D4F1D67D8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_SupplementalCashFlowInformationRelatedToLeasesTableTextBlock_414067DBEC2BA6CE1409DE3D4F1D67D8" xlink:to="lab_efoi_SupplementalCashFlowInformationRelatedToLeasesTableTextBlock_414067DBEC2BA6CE1409DE3D4F1D67D8" xlink:type="arc"/>
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<link:label id="lab_efoi_CommercialLightingRetrofitCompanyMember_359209AB520F21F0EBF907CE9CB05ECC_terseLabel_en-US" xlink:label="lab_efoi_CommercialLightingRetrofitCompanyMember_359209AB520F21F0EBF907CE9CB05ECC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Commercial Lighting Retrofit Company </link:label>
<link:label id="lab_efoi_CommercialLightingRetrofitCompanyMember_359209AB520F21F0EBF907CE9CB05ECC_label_en-US" xlink:label="lab_efoi_CommercialLightingRetrofitCompanyMember_359209AB520F21F0EBF907CE9CB05ECC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Commercial Lighting Retrofit Company [Member] </link:label>
<link:label id="lab_efoi_CommercialLightingRetrofitCompanyMember_359209AB520F21F0EBF907CE9CB05ECC_documentation_en-US" xlink:label="lab_efoi_CommercialLightingRetrofitCompanyMember_359209AB520F21F0EBF907CE9CB05ECC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Commercial Lighting Retrofit Company [Member] </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_CommercialLightingRetrofitCompanyMember" xlink:label="loc_efoi_CommercialLightingRetrofitCompanyMember_359209AB520F21F0EBF907CE9CB05ECC" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ConcentrationRiskLineItems_A0001BEEEE1F0392E23107CE9CB0DB61_terseLabel_en-US" xlink:label="lab_us-gaap_ConcentrationRiskLineItems_A0001BEEEE1F0392E23107CE9CB0DB61" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Concentration Risk [Line Items] </link:label>
<link:label id="lab_us-gaap_ConcentrationRiskLineItems_A0001BEEEE1F0392E23107CE9CB0DB61_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskLineItems_A0001BEEEE1F0392E23107CE9CB0DB61" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Concentration Risk [Line Items] </link:label>
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<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_44D966AC2D4ED0DDB20A07CE9CB0C7EC_terseLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_44D966AC2D4ED0DDB20A07CE9CB0C7EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash and cash equivalents </link:label>
<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_44D966AC2D4ED0DDB20A07CE9CB0C7EC_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_44D966AC2D4ED0DDB20A07CE9CB0C7EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_44D966AC2D4ED0DDB20A07CE9CB0C7EC" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RestrictedCash_29B9DDB972708938D03B07CE9CB0508B_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedCash_29B9DDB972708938D03B07CE9CB0508B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restricted cash held </link:label>
<link:label id="lab_us-gaap_RestrictedCash_29B9DDB972708938D03B07CE9CB0508B_label_en-US" xlink:label="lab_us-gaap_RestrictedCash_29B9DDB972708938D03B07CE9CB0508B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restricted Cash </link:label>
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<link:label id="lab_efoi_IncreaseDecreaseInInventoryReserves_D78246C900C29F411EC707CE9CB0F17D_terseLabel_en-US" xlink:label="lab_efoi_IncreaseDecreaseInInventoryReserves_D78246C900C29F411EC707CE9CB0F17D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Provision for slow-moving and obsolete inventories </link:label>
<link:label id="lab_efoi_IncreaseDecreaseInInventoryReserves_D78246C900C29F411EC707CE9CB0F17D_label_en-US" xlink:label="lab_efoi_IncreaseDecreaseInInventoryReserves_D78246C900C29F411EC707CE9CB0F17D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) In Inventory Reserves </link:label>
<link:label id="lab_efoi_IncreaseDecreaseInInventoryReserves_D78246C900C29F411EC707CE9CB0F17D_documentation_en-US" xlink:label="lab_efoi_IncreaseDecreaseInInventoryReserves_D78246C900C29F411EC707CE9CB0F17D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) In Inventory Reserves </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_IncreaseDecreaseInInventoryReserves" xlink:label="loc_efoi_IncreaseDecreaseInInventoryReserves_D78246C900C29F411EC707CE9CB0F17D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_InventoryWriteDown_48BF3E1561186B6CF86D07CE9CB06623_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryWriteDown_48BF3E1561186B6CF86D07CE9CB06623" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net reduction of excess and obsolete reserves </link:label>
<link:label id="lab_us-gaap_InventoryWriteDown_48BF3E1561186B6CF86D07CE9CB06623_label_en-US" xlink:label="lab_us-gaap_InventoryWriteDown_48BF3E1561186B6CF86D07CE9CB06623" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory Write-down </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryWriteDown" xlink:label="loc_us-gaap_InventoryWriteDown_48BF3E1561186B6CF86D07CE9CB06623" xlink:type="locator"/>
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<link:label id="lab_efoi_ContractWithCustomerPaymentTerms_5F62FB4337C1870E329807CE9CB03B50_terseLabel_en-US" xlink:label="lab_efoi_ContractWithCustomerPaymentTerms_5F62FB4337C1870E329807CE9CB03B50" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Payment terms </link:label>
<link:label id="lab_efoi_ContractWithCustomerPaymentTerms_5F62FB4337C1870E329807CE9CB03B50_label_en-US" xlink:label="lab_efoi_ContractWithCustomerPaymentTerms_5F62FB4337C1870E329807CE9CB03B50" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract With Customer, Payment Terms </link:label>
<link:label id="lab_efoi_ContractWithCustomerPaymentTerms_5F62FB4337C1870E329807CE9CB03B50_documentation_en-US" xlink:label="lab_efoi_ContractWithCustomerPaymentTerms_5F62FB4337C1870E329807CE9CB03B50" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Contract With Customer, Payment Terms </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_ContractWithCustomerPaymentTerms" xlink:label="loc_efoi_ContractWithCustomerPaymentTerms_5F62FB4337C1870E329807CE9CB03B50" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_227450D03805AAE4085707CE9CB0EF98_verboseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_227450D03805AAE4085707CE9CB0EF98" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Deferred tax assets, operating loss carry-forwards </link:label>
<link:label id="lab_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_227450D03805AAE4085707CE9CB0EF98_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_227450D03805AAE4085707CE9CB0EF98" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Tax Assets, Operating Loss Carryforwards </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_227450D03805AAE4085707CE9CB0EF98" xlink:type="locator"/>
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<link:label id="lab_efoi_DeferredTaxAssetsOperatingLossCarryforwardsPortionAvailableAfterApplicationOfIRCSection382Limitations_047C74C2C7BDBB3FCFF907CE9CB0F499_terseLabel_en-US" xlink:label="lab_efoi_DeferredTaxAssetsOperatingLossCarryforwardsPortionAvailableAfterApplicationOfIRCSection382Limitations_047C74C2C7BDBB3FCFF907CE9CB0F499" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred tax assets, operating loss carryforwards, portion available after application of IRC Section 382 limitations </link:label>
<link:label id="lab_efoi_DeferredTaxAssetsOperatingLossCarryforwardsPortionAvailableAfterApplicationOfIRCSection382Limitations_047C74C2C7BDBB3FCFF907CE9CB0F499_label_en-US" xlink:label="lab_efoi_DeferredTaxAssetsOperatingLossCarryforwardsPortionAvailableAfterApplicationOfIRCSection382Limitations_047C74C2C7BDBB3FCFF907CE9CB0F499" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Tax Assets, Operating Loss Carryforwards, Portion Available After Application Of IRC Section 382 Limitations </link:label>
<link:label id="lab_efoi_DeferredTaxAssetsOperatingLossCarryforwardsPortionAvailableAfterApplicationOfIRCSection382Limitations_047C74C2C7BDBB3FCFF907CE9CB0F499_documentation_en-US" xlink:label="lab_efoi_DeferredTaxAssetsOperatingLossCarryforwardsPortionAvailableAfterApplicationOfIRCSection382Limitations_047C74C2C7BDBB3FCFF907CE9CB0F499" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Deferred Tax Assets, Operating Loss Carryforwards, Portion Available After Application Of IRC Section 382 Limitations </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_DeferredTaxAssetsOperatingLossCarryforwardsPortionAvailableAfterApplicationOfIRCSection382Limitations" xlink:label="loc_efoi_DeferredTaxAssetsOperatingLossCarryforwardsPortionAvailableAfterApplicationOfIRCSection382Limitations_047C74C2C7BDBB3FCFF907CE9CB0F499" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLossCarryforwards_5F0AC3966D26FD3BC82407CE9CB084C2_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLossCarryforwards_5F0AC3966D26FD3BC82407CE9CB084C2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating loss carry-forwards </link:label>
<link:label id="lab_us-gaap_OperatingLossCarryforwards_5F0AC3966D26FD3BC82407CE9CB084C2_label_en-US" xlink:label="lab_us-gaap_OperatingLossCarryforwards_5F0AC3966D26FD3BC82407CE9CB084C2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Loss Carryforwards </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="loc_us-gaap_OperatingLossCarryforwards_5F0AC3966D26FD3BC82407CE9CB084C2" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch_EADB0EB11A0811965E8007CE9CB0C74A_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch_EADB0EB11A0811965E8007CE9CB0C74A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred tax assets, tax credit carryforwards, research </link:label>
<link:label id="lab_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch_EADB0EB11A0811965E8007CE9CB0C74A_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch_EADB0EB11A0811965E8007CE9CB0C74A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Tax Assets, Tax Credit Carryforwards, Research </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_F1E043F5F5B6540A2BB907CE9CB0B77A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AdvertisingExpense_F32F5CAD34C5BB03341B07CE9CB01735_terseLabel_en-US" xlink:label="lab_us-gaap_AdvertisingExpense_F32F5CAD34C5BB03341B07CE9CB01735" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Advertising expense </link:label>
<link:label id="lab_us-gaap_AdvertisingExpense_F32F5CAD34C5BB03341B07CE9CB01735_label_en-US" xlink:label="lab_us-gaap_AdvertisingExpense_F32F5CAD34C5BB03341B07CE9CB01735" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Advertising Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdvertisingExpense" xlink:label="loc_us-gaap_AdvertisingExpense_F32F5CAD34C5BB03341B07CE9CB01735" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdvertisingExpense_F32F5CAD34C5BB03341B07CE9CB01735" xlink:to="lab_us-gaap_AdvertisingExpense_F32F5CAD34C5BB03341B07CE9CB01735" xlink:type="arc"/>
<link:label id="lab_efoi_StandardProductWarrantyNumberofYears_E2E7B5047984C69E11D907CE9CB0C19A_verboseLabel_en-US" xlink:label="lab_efoi_StandardProductWarrantyNumberofYears_E2E7B5047984C69E11D907CE9CB0C19A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Warranty for finished goods, number of years </link:label>
<link:label id="lab_efoi_StandardProductWarrantyNumberofYears_E2E7B5047984C69E11D907CE9CB0C19A_label_en-US" xlink:label="lab_efoi_StandardProductWarrantyNumberofYears_E2E7B5047984C69E11D907CE9CB0C19A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Standard Product Warranty, Number of Years </link:label>
<link:label id="lab_efoi_StandardProductWarrantyNumberofYears_E2E7B5047984C69E11D907CE9CB0C19A_documentation_en-US" xlink:label="lab_efoi_StandardProductWarrantyNumberofYears_E2E7B5047984C69E11D907CE9CB0C19A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Standard Product Warranty, Number of Years </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_StandardProductWarrantyNumberofYears" xlink:label="loc_efoi_StandardProductWarrantyNumberofYears_E2E7B5047984C69E11D907CE9CB0C19A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_StandardProductWarrantyNumberofYears_E2E7B5047984C69E11D907CE9CB0C19A" xlink:to="lab_efoi_StandardProductWarrantyNumberofYears_E2E7B5047984C69E11D907CE9CB0C19A" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeaseLiability_A7384023FFB3B30714AA07CE9CB0CA41_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability_A7384023FFB3B30714AA07CE9CB0CA41" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating lease liabilities </link:label>
<link:label id="lab_us-gaap_OperatingLeaseLiability_A7384023FFB3B30714AA07CE9CB0CA41_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability_A7384023FFB3B30714AA07CE9CB0CA41" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Liability </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_A7384023FFB3B30714AA07CE9CB0CA41" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiability_A7384023FFB3B30714AA07CE9CB0CA41" xlink:to="lab_us-gaap_OperatingLeaseLiability_A7384023FFB3B30714AA07CE9CB0CA41" xlink:type="arc"/>
<link:label id="lab_us-gaap_RestructuringReserveAccrualAdjustment1_ECB846931A0FB212CF1A07CE9CB0BE5F_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringReserveAccrualAdjustment1_ECB846931A0FB212CF1A07CE9CB0BE5F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Adjustment of lease obligations </link:label>
<link:label id="lab_us-gaap_RestructuringReserveAccrualAdjustment1_ECB846931A0FB212CF1A07CE9CB0BE5F_label_en-US" xlink:label="lab_us-gaap_RestructuringReserveAccrualAdjustment1_ECB846931A0FB212CF1A07CE9CB0BE5F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructuring Reserve, Accrual Adjustment </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringReserveAccrualAdjustment1" xlink:label="loc_us-gaap_RestructuringReserveAccrualAdjustment1_ECB846931A0FB212CF1A07CE9CB0BE5F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestructuringReserveAccrualAdjustment1_ECB846931A0FB212CF1A07CE9CB0BE5F" xlink:to="lab_us-gaap_RestructuringReserveAccrualAdjustment1_ECB846931A0FB212CF1A07CE9CB0BE5F" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeaseImpairmentLoss_C38974681BBAF2CB288107CE9CB08188_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseImpairmentLoss_C38974681BBAF2CB288107CE9CB08188" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating lease, impairment loss </link:label>
<link:label id="lab_us-gaap_OperatingLeaseImpairmentLoss_C38974681BBAF2CB288107CE9CB08188_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseImpairmentLoss_C38974681BBAF2CB288107CE9CB08188" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Impairment Loss </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseImpairmentLoss" xlink:label="loc_us-gaap_OperatingLeaseImpairmentLoss_C38974681BBAF2CB288107CE9CB08188" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseImpairmentLoss_C38974681BBAF2CB288107CE9CB08188" xlink:to="lab_us-gaap_OperatingLeaseImpairmentLoss_C38974681BBAF2CB288107CE9CB08188" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_53B1E28143F8DF96FCD0DE42E7101B40_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_53B1E28143F8DF96FCD0DE42E7101B40" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Earnings Per Share, Basic and Diluted </link:label>
<link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_53B1E28143F8DF96FCD0DE42E7101B40_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_53B1E28143F8DF96FCD0DE42E7101B40" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_53B1E28143F8DF96FCD0DE42E7101B40" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_53B1E28143F8DF96FCD0DE42E7101B40" xlink:to="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_53B1E28143F8DF96FCD0DE42E7101B40" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_47034359555EFCBAFDFBDE42E711AC1A_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_47034359555EFCBAFDFBDE42E711AC1A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Warranty Activity </link:label>
<link:label id="lab_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_47034359555EFCBAFDFBDE42E711AC1A_label_en-US" xlink:label="lab_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_47034359555EFCBAFDFBDE42E711AC1A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Product Warranty Liability [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_47034359555EFCBAFDFBDE42E711AC1A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_47034359555EFCBAFDFBDE42E711AC1A" xlink:to="lab_us-gaap_ScheduleOfProductWarrantyLiabilityTableTextBlock_47034359555EFCBAFDFBDE42E711AC1A" xlink:type="arc"/>
<link:label id="lab_us-gaap_SubleaseIncome_D6E0BAFFE536EEF4E9F6C58309A88035_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_SubleaseIncome_D6E0BAFFE536EEF4E9F6C58309A88035" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Sublease income </link:label>
<link:label id="lab_us-gaap_SubleaseIncome_D6E0BAFFE536EEF4E9F6C58309A88035_label_en-US" xlink:label="lab_us-gaap_SubleaseIncome_D6E0BAFFE536EEF4E9F6C58309A88035" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Sublease Income </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubleaseIncome" xlink:label="loc_us-gaap_SubleaseIncome_D6E0BAFFE536EEF4E9F6C58309A88035" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubleaseIncome_D6E0BAFFE536EEF4E9F6C58309A88035" xlink:to="lab_us-gaap_SubleaseIncome_D6E0BAFFE536EEF4E9F6C58309A88035" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeaseCost_D952512D43B0D22EADADC58309A9DF6C_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_D952512D43B0D22EADADC58309A9DF6C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating lease cost </link:label>
<link:label id="lab_us-gaap_OperatingLeaseCost_D952512D43B0D22EADADC58309A9DF6C_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_D952512D43B0D22EADADC58309A9DF6C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Cost </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseCost" xlink:label="loc_us-gaap_OperatingLeaseCost_D952512D43B0D22EADADC58309A9DF6C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseCost_D952512D43B0D22EADADC58309A9DF6C" xlink:to="lab_us-gaap_OperatingLeaseCost_D952512D43B0D22EADADC58309A9DF6C" xlink:type="arc"/>
<link:label id="lab_efoi_OperatingLeaseCostNetOfSubleaseIncome_1CDF253B79434994DA3FC58309A9CA5E_totalLabel_en-US" xlink:label="lab_efoi_OperatingLeaseCostNetOfSubleaseIncome_1CDF253B79434994DA3FC58309A9CA5E" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Operating lease cost, net </link:label>
<link:label id="lab_efoi_OperatingLeaseCostNetOfSubleaseIncome_1CDF253B79434994DA3FC58309A9CA5E_label_en-US" xlink:label="lab_efoi_OperatingLeaseCostNetOfSubleaseIncome_1CDF253B79434994DA3FC58309A9CA5E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Cost, Net Of Sublease Income </link:label>
<link:label id="lab_efoi_OperatingLeaseCostNetOfSubleaseIncome_1CDF253B79434994DA3FC58309A9CA5E_documentation_en-US" xlink:label="lab_efoi_OperatingLeaseCostNetOfSubleaseIncome_1CDF253B79434994DA3FC58309A9CA5E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Operating Lease, Cost, Net Of Sublease Income </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_OperatingLeaseCostNetOfSubleaseIncome" xlink:label="loc_efoi_OperatingLeaseCostNetOfSubleaseIncome_1CDF253B79434994DA3FC58309A9CA5E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_OperatingLeaseCostNetOfSubleaseIncome_1CDF253B79434994DA3FC58309A9CA5E" xlink:to="lab_efoi_OperatingLeaseCostNetOfSubleaseIncome_1CDF253B79434994DA3FC58309A9CA5E" xlink:type="arc"/>
<link:label id="lab_efoi_RestructuredLeaseSubleaseIncome_3A8058676B48411BA696C58309A9A2F9_negatedTerseLabel_en-US" xlink:label="lab_efoi_RestructuredLeaseSubleaseIncome_3A8058676B48411BA696C58309A9A2F9" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Sublease income </link:label>
<link:label id="lab_efoi_RestructuredLeaseSubleaseIncome_3A8058676B48411BA696C58309A9A2F9_label_en-US" xlink:label="lab_efoi_RestructuredLeaseSubleaseIncome_3A8058676B48411BA696C58309A9A2F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructured Lease, Sublease Income </link:label>
<link:label id="lab_efoi_RestructuredLeaseSubleaseIncome_3A8058676B48411BA696C58309A9A2F9_documentation_en-US" xlink:label="lab_efoi_RestructuredLeaseSubleaseIncome_3A8058676B48411BA696C58309A9A2F9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Restructured Lease, Sublease Income </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuredLeaseSubleaseIncome" xlink:label="loc_efoi_RestructuredLeaseSubleaseIncome_3A8058676B48411BA696C58309A9A2F9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_RestructuredLeaseSubleaseIncome_3A8058676B48411BA696C58309A9A2F9" xlink:to="lab_efoi_RestructuredLeaseSubleaseIncome_3A8058676B48411BA696C58309A9A2F9" xlink:type="arc"/>
<link:label id="lab_efoi_RestructuredLeaseOperatingLeaseCost_3CFE0449FAA96A9CBE03C58309A936AB_terseLabel_en-US" xlink:label="lab_efoi_RestructuredLeaseOperatingLeaseCost_3CFE0449FAA96A9CBE03C58309A936AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lease cost </link:label>
<link:label id="lab_efoi_RestructuredLeaseOperatingLeaseCost_3CFE0449FAA96A9CBE03C58309A936AB_label_en-US" xlink:label="lab_efoi_RestructuredLeaseOperatingLeaseCost_3CFE0449FAA96A9CBE03C58309A936AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructured Lease, Operating Lease, Cost </link:label>
<link:label id="lab_efoi_RestructuredLeaseOperatingLeaseCost_3CFE0449FAA96A9CBE03C58309A936AB_documentation_en-US" xlink:label="lab_efoi_RestructuredLeaseOperatingLeaseCost_3CFE0449FAA96A9CBE03C58309A936AB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Restructured Lease, Operating Lease, Cost </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuredLeaseOperatingLeaseCost" xlink:label="loc_efoi_RestructuredLeaseOperatingLeaseCost_3CFE0449FAA96A9CBE03C58309A936AB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_RestructuredLeaseOperatingLeaseCost_3CFE0449FAA96A9CBE03C58309A936AB" xlink:to="lab_efoi_RestructuredLeaseOperatingLeaseCost_3CFE0449FAA96A9CBE03C58309A936AB" xlink:type="arc"/>
<link:label id="lab_efoi_RestructuredLeaseOperatingLeaseCostNetOfSubleaseIncome_37F7D9ACF24C9468AA36C58309A91AA5_totalLabel_en-US" xlink:label="lab_efoi_RestructuredLeaseOperatingLeaseCostNetOfSubleaseIncome_37F7D9ACF24C9468AA36C58309A91AA5" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Restructured lease cost, net </link:label>
<link:label id="lab_efoi_RestructuredLeaseOperatingLeaseCostNetOfSubleaseIncome_37F7D9ACF24C9468AA36C58309A91AA5_label_en-US" xlink:label="lab_efoi_RestructuredLeaseOperatingLeaseCostNetOfSubleaseIncome_37F7D9ACF24C9468AA36C58309A91AA5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructured Lease, Operating Lease, Cost, Net Of Sublease Income </link:label>
<link:label id="lab_efoi_RestructuredLeaseOperatingLeaseCostNetOfSubleaseIncome_37F7D9ACF24C9468AA36C58309A91AA5_documentation_en-US" xlink:label="lab_efoi_RestructuredLeaseOperatingLeaseCostNetOfSubleaseIncome_37F7D9ACF24C9468AA36C58309A91AA5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Restructured Lease, Operating Lease, Cost, Net Of Sublease Income </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuredLeaseOperatingLeaseCostNetOfSubleaseIncome" xlink:label="loc_efoi_RestructuredLeaseOperatingLeaseCostNetOfSubleaseIncome_37F7D9ACF24C9468AA36C58309A91AA5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_RestructuredLeaseOperatingLeaseCostNetOfSubleaseIncome_37F7D9ACF24C9468AA36C58309A91AA5" xlink:to="lab_efoi_RestructuredLeaseOperatingLeaseCostNetOfSubleaseIncome_37F7D9ACF24C9468AA36C58309A91AA5" xlink:type="arc"/>
<link:label id="lab_us-gaap_FinanceLeaseInterestExpense_47443B36F025C14B32E0C58309A9B8A1_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestExpense_47443B36F025C14B32E0C58309A9B8A1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Interest on lease liabilities </link:label>
<link:label id="lab_us-gaap_FinanceLeaseInterestExpense_47443B36F025C14B32E0C58309A9B8A1_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseInterestExpense_47443B36F025C14B32E0C58309A9B8A1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Interest Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseInterestExpense" xlink:label="loc_us-gaap_FinanceLeaseInterestExpense_47443B36F025C14B32E0C58309A9B8A1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LeaseCost_F8FDEDB33627011284F1C58309AAE094_totalLabel_en-US" xlink:label="lab_us-gaap_LeaseCost_F8FDEDB33627011284F1C58309AAE094" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total lease cost, net </link:label>
<link:label id="lab_us-gaap_LeaseCost_F8FDEDB33627011284F1C58309AAE094_label_en-US" xlink:label="lab_us-gaap_LeaseCost_F8FDEDB33627011284F1C58309AAE094" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease, Cost </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseCost" xlink:label="loc_us-gaap_LeaseCost_F8FDEDB33627011284F1C58309AAE094" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RelatedPartyTransactionsAbstract_66238C76EEAACFD5F3FEC5462EBA9D77_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsAbstract_66238C76EEAACFD5F3FEC5462EBA9D77" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Related Party Transactions [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RelatedPartyTransactionsAbstract" xlink:label="loc_us-gaap_RelatedPartyTransactionsAbstract_66238C76EEAACFD5F3FEC5462EBA9D77" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_66238C76EEAACFD5F3FEC5462EBA9D77" xlink:to="lab_us-gaap_RelatedPartyTransactionsAbstract_66238C76EEAACFD5F3FEC5462EBA9D77" xlink:type="arc"/>
<link:label id="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_221046D50BCA92F2ABD8C5462EBB6E17_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_221046D50BCA92F2ABD8C5462EBB6E17" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Related Party Transactions </link:label>
<link:label id="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_221046D50BCA92F2ABD8C5462EBB6E17_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_221046D50BCA92F2ABD8C5462EBB6E17" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Related Party Transactions Disclosure [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:label="loc_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_221046D50BCA92F2ABD8C5462EBB6E17" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_221046D50BCA92F2ABD8C5462EBB6E17" xlink:to="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_221046D50BCA92F2ABD8C5462EBB6E17" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_4EA54C176756E55A55E7C5B544302DC9_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_4EA54C176756E55A55E7C5B544302DC9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating Leases </link:label>
<link:label id="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_4EA54C176756E55A55E7C5B544302DC9_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_4EA54C176756E55A55E7C5B544302DC9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payment, Due, Rolling Maturity [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract" xlink:label="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_4EA54C176756E55A55E7C5B544302DC9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_4EA54C176756E55A55E7C5B544302DC9" xlink:to="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_4EA54C176756E55A55E7C5B544302DC9" xlink:type="arc"/>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths_4E9D82472E4B1A8B8A21C5B544315CB0_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths_4E9D82472E4B1A8B8A21C5B544315CB0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths_4E9D82472E4B1A8B8A21C5B544315CB0_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths_4E9D82472E4B1A8B8A21C5B544315CB0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths_4E9D82472E4B1A8B8A21C5B544315CB0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths_4E9D82472E4B1A8B8A21C5B544315CB0" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths_4E9D82472E4B1A8B8A21C5B544315CB0" xlink:type="arc"/>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo_BF361FF45942156532C3C5B544316BAF_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo_BF361FF45942156532C3C5B544316BAF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo_BF361FF45942156532C3C5B544316BAF_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo_BF361FF45942156532C3C5B544316BAF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo_BF361FF45942156532C3C5B544316BAF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo_BF361FF45942156532C3C5B544316BAF" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo_BF361FF45942156532C3C5B544316BAF" xlink:type="arc"/>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree_327AFA32419EC8C1BFC7C5B54431989B_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree_327AFA32419EC8C1BFC7C5B54431989B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree_327AFA32419EC8C1BFC7C5B54431989B_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree_327AFA32419EC8C1BFC7C5B54431989B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree_327AFA32419EC8C1BFC7C5B54431989B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree_327AFA32419EC8C1BFC7C5B54431989B" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree_327AFA32419EC8C1BFC7C5B54431989B" xlink:type="arc"/>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour_1385B7183252B5F28AF0C5B54431ACC0_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour_1385B7183252B5F28AF0C5B54431ACC0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour_1385B7183252B5F28AF0C5B54431ACC0_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour_1385B7183252B5F28AF0C5B54431ACC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour_1385B7183252B5F28AF0C5B54431ACC0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour_1385B7183252B5F28AF0C5B54431ACC0" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour_1385B7183252B5F28AF0C5B54431ACC0" xlink:type="arc"/>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive_9AA8C2AB4AED47908932C5B54431BF57_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive_9AA8C2AB4AED47908932C5B54431BF57" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2024 </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive_9AA8C2AB4AED47908932C5B54431BF57_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive_9AA8C2AB4AED47908932C5B54431BF57" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive_9AA8C2AB4AED47908932C5B54431BF57" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive_9AA8C2AB4AED47908932C5B54431BF57" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive_9AA8C2AB4AED47908932C5B54431BF57" xlink:type="arc"/>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ACFAF4A7C8E3FAF8333AC5B5443213B8_totalLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ACFAF4A7C8E3FAF8333AC5B5443213B8" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total future undiscounted lease payments </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ACFAF4A7C8E3FAF8333AC5B5443213B8_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ACFAF4A7C8E3FAF8333AC5B5443213B8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ACFAF4A7C8E3FAF8333AC5B5443213B8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ACFAF4A7C8E3FAF8333AC5B5443213B8" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_ACFAF4A7C8E3FAF8333AC5B5443213B8" xlink:type="arc"/>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_2D929BE938EECA030C2AC5B544320356_negatedLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_2D929BE938EECA030C2AC5B544320356" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Less imputed interest </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_2D929BE938EECA030C2AC5B544320356_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_2D929BE938EECA030C2AC5B544320356" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Undiscounted Excess Amount </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_2D929BE938EECA030C2AC5B544320356" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_2D929BE938EECA030C2AC5B544320356" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_2D929BE938EECA030C2AC5B544320356" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeaseLiability_6129F081529BCCC0EA7EC5B54432E532_verboseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability_6129F081529BCCC0EA7EC5B54432E532" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Total lease obligations </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_6129F081529BCCC0EA7EC5B54432E532" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiability_6129F081529BCCC0EA7EC5B54432E532" xlink:to="lab_us-gaap_OperatingLeaseLiability_6129F081529BCCC0EA7EC5B54432E532" xlink:type="arc"/>
<link:label id="lab_efoi_RestructuredLeasesOperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_6B36DAF9D00A7BE22515C5B54432A8D4_terseLabel_en-US" xlink:label="lab_efoi_RestructuredLeasesOperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_6B36DAF9D00A7BE22515C5B54432A8D4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restructured Leases </link:label>
<link:label id="lab_efoi_RestructuredLeasesOperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_6B36DAF9D00A7BE22515C5B54432A8D4_label_en-US" xlink:label="lab_efoi_RestructuredLeasesOperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_6B36DAF9D00A7BE22515C5B54432A8D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructured Leases, Operating Lease Liabilities, Payments, Due, Rolling Maturity [Abstract] </link:label>
<link:label id="lab_efoi_RestructuredLeasesOperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_6B36DAF9D00A7BE22515C5B54432A8D4_documentation_en-US" xlink:label="lab_efoi_RestructuredLeasesOperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_6B36DAF9D00A7BE22515C5B54432A8D4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Restructured Leases, Operating Lease Liabilities, Payments, Due, Rolling Maturity [Abstract] </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuredLeasesOperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract" xlink:label="loc_efoi_RestructuredLeasesOperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_6B36DAF9D00A7BE22515C5B54432A8D4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_RestructuredLeasesOperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_6B36DAF9D00A7BE22515C5B54432A8D4" xlink:to="lab_efoi_RestructuredLeasesOperatingLeaseLiabilitiesPaymentsDueRollingMaturityAbstract_6B36DAF9D00A7BE22515C5B54432A8D4" xlink:type="arc"/>
<link:label id="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths_6A672FD7AA11ED72FAAEC5B54432BE00_terseLabel_en-US" xlink:label="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths_6A672FD7AA11ED72FAAEC5B54432BE00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>
<link:label id="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths_6A672FD7AA11ED72FAAEC5B54432BE00_label_en-US" xlink:label="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths_6A672FD7AA11ED72FAAEC5B54432BE00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructured Leases, Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months </link:label>
<link:label id="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths_6A672FD7AA11ED72FAAEC5B54432BE00_documentation_en-US" xlink:label="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths_6A672FD7AA11ED72FAAEC5B54432BE00" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Restructured Leases, Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths" xlink:label="loc_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths_6A672FD7AA11ED72FAAEC5B54432BE00" xlink:type="locator"/>
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<link:label id="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour_71058CC3BDC62E98864AC5B5443328C4_terseLabel_en-US" xlink:label="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour_71058CC3BDC62E98864AC5B5443328C4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>
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<link:label id="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour_71058CC3BDC62E98864AC5B5443328C4_documentation_en-US" xlink:label="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour_71058CC3BDC62E98864AC5B5443328C4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Restructured Leases, Lessee, Operating Lease, Liability, Payments, Due In Rolling Year Four </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour" xlink:label="loc_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour_71058CC3BDC62E98864AC5B5443328C4" xlink:type="locator"/>
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<link:label id="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive_690AC76C0F323108AF51C5B5443375D5_terseLabel_en-US" xlink:label="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive_690AC76C0F323108AF51C5B5443375D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2024 </link:label>
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<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive" xlink:label="loc_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive_690AC76C0F323108AF51C5B5443375D5" xlink:type="locator"/>
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<link:label id="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDue_3D487435573334D75EB3C5B544331B89_totalLabel_en-US" xlink:label="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDue_3D487435573334D75EB3C5B544331B89" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total future undiscounted lease payments </link:label>
<link:label id="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDue_3D487435573334D75EB3C5B544331B89_label_en-US" xlink:label="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityPaymentsDue_3D487435573334D75EB3C5B544331B89" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructured Leases, Lessee, Operating Lease, Liability, Payments, Due </link:label>
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<link:label id="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityUndiscountedExcessAmount_9AD452E161A8BB3CA0EAC5B54433B018_negatedTerseLabel_en-US" xlink:label="lab_efoi_RestructuredLeasesLesseeOperatingLeaseLiabilityUndiscountedExcessAmount_9AD452E161A8BB3CA0EAC5B54433B018" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Less imputed interest </link:label>
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<link:label id="lab_efoi_RestructuredOperatingLeaseLiability_5BC5AD674AA4218ECC6AC5B5443433BA_verboseLabel_en-US" xlink:label="lab_efoi_RestructuredOperatingLeaseLiability_5BC5AD674AA4218ECC6AC5B5443433BA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Total lease obligations </link:label>
<link:label id="lab_efoi_RestructuredOperatingLeaseLiability_5BC5AD674AA4218ECC6AC5B5443433BA_label_en-US" xlink:label="lab_efoi_RestructuredOperatingLeaseLiability_5BC5AD674AA4218ECC6AC5B5443433BA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructured Operating Lease, Liability </link:label>
<link:label id="lab_efoi_RestructuredOperatingLeaseLiability_5BC5AD674AA4218ECC6AC5B5443433BA_documentation_en-US" xlink:label="lab_efoi_RestructuredOperatingLeaseLiability_5BC5AD674AA4218ECC6AC5B5443433BA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Restructured Operating Lease, Liability </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuredOperatingLeaseLiability" xlink:label="loc_efoi_RestructuredOperatingLeaseLiability_5BC5AD674AA4218ECC6AC5B5443433BA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsRollingMaturityAbstract_F7FF5367BAAB396DE52BC5B544344361_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsRollingMaturityAbstract_F7FF5367BAAB396DE52BC5B544344361" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restructured Leases Sublease Payments </link:label>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsRollingMaturityAbstract_F7FF5367BAAB396DE52BC5B544344361_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsRollingMaturityAbstract_F7FF5367BAAB396DE52BC5B544344361" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Payments, Rolling Maturity [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsRollingMaturityAbstract" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsRollingMaturityAbstract_F7FF5367BAAB396DE52BC5B544344361" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextRollingTwelveMonths_4FC6C3F0827C13751608C5B54434DB7F_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextRollingTwelveMonths_4FC6C3F0827C13751608C5B54434DB7F" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextRollingTwelveMonths_4FC6C3F0827C13751608C5B54434DB7F_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextRollingTwelveMonths_4FC6C3F0827C13751608C5B54434DB7F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Payments to be Received, Next Rolling Twelve Months </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextRollingTwelveMonths" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextRollingTwelveMonths_4FC6C3F0827C13751608C5B54434DB7F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearTwo_2F4AB95072A98FB7751DC5B544346AC6_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearTwo_2F4AB95072A98FB7751DC5B544346AC6" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearTwo_2F4AB95072A98FB7751DC5B544346AC6_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearTwo_2F4AB95072A98FB7751DC5B544346AC6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Payments to be Received, Rolling Year Two </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearTwo" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearTwo_2F4AB95072A98FB7751DC5B544346AC6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearThree_AE14D669E995FB2AFAB0C5B544344CAA_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearThree_AE14D669E995FB2AFAB0C5B544344CAA" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearThree_AE14D669E995FB2AFAB0C5B544344CAA_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearThree_AE14D669E995FB2AFAB0C5B544344CAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Payments to be Received, Rolling Year Three </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearThree" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearThree_AE14D669E995FB2AFAB0C5B544344CAA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearThree_AE14D669E995FB2AFAB0C5B544344CAA" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearThree_AE14D669E995FB2AFAB0C5B544344CAA" xlink:type="arc"/>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFour_47F778E615FF5C7C6FEDC5B54435ED30_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFour_47F778E615FF5C7C6FEDC5B54435ED30" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFour_47F778E615FF5C7C6FEDC5B54435ED30_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFour_47F778E615FF5C7C6FEDC5B54435ED30" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Payments to be Received, Rolling Year Four </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFour" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFour_47F778E615FF5C7C6FEDC5B54435ED30" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFour_47F778E615FF5C7C6FEDC5B54435ED30" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFour_47F778E615FF5C7C6FEDC5B54435ED30" xlink:type="arc"/>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFive_440E7CD2AB6645D70C21C5B54435BE6A_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFive_440E7CD2AB6645D70C21C5B54435BE6A" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> 2024 </link:label>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFive_440E7CD2AB6645D70C21C5B54435BE6A_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFive_440E7CD2AB6645D70C21C5B54435BE6A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Payments to be Received, Rolling Year Five </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFive" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFive_440E7CD2AB6645D70C21C5B54435BE6A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFive_440E7CD2AB6645D70C21C5B54435BE6A" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRollingYearFive_440E7CD2AB6645D70C21C5B54435BE6A" xlink:type="arc"/>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceived_1E0739F25D9B619A3FB3C5B5443535D4_negatedTotalLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceived_1E0739F25D9B619A3FB3C5B5443535D4" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="resource" xml:lang="en-US"> Total future undiscounted lease payments </link:label>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceived_1E0739F25D9B619A3FB3C5B5443535D4_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceived_1E0739F25D9B619A3FB3C5B5443535D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Payments to be Received </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceived" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_1E0739F25D9B619A3FB3C5B5443535D4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_1E0739F25D9B619A3FB3C5B5443535D4" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceived_1E0739F25D9B619A3FB3C5B5443535D4" xlink:type="arc"/>
<link:label id="lab_efoi_LessorOperatingLeaseLiabilityUndiscountedExcessAmount_099AC27BC5E507AE5758C5B54435F002_verboseLabel_en-US" xlink:label="lab_efoi_LessorOperatingLeaseLiabilityUndiscountedExcessAmount_099AC27BC5E507AE5758C5B54435F002" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Less imputed interest </link:label>
<link:label id="lab_efoi_LessorOperatingLeaseLiabilityUndiscountedExcessAmount_099AC27BC5E507AE5758C5B54435F002_label_en-US" xlink:label="lab_efoi_LessorOperatingLeaseLiabilityUndiscountedExcessAmount_099AC27BC5E507AE5758C5B54435F002" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Liability, Undiscounted Excess Amount </link:label>
<link:label id="lab_efoi_LessorOperatingLeaseLiabilityUndiscountedExcessAmount_099AC27BC5E507AE5758C5B54435F002_documentation_en-US" xlink:label="lab_efoi_LessorOperatingLeaseLiabilityUndiscountedExcessAmount_099AC27BC5E507AE5758C5B54435F002" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Liability, Undiscounted Excess Amount </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_LessorOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_efoi_LessorOperatingLeaseLiabilityUndiscountedExcessAmount_099AC27BC5E507AE5758C5B54435F002" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_LessorOperatingLeaseLiabilityUndiscountedExcessAmount_099AC27BC5E507AE5758C5B54435F002" xlink:to="lab_efoi_LessorOperatingLeaseLiabilityUndiscountedExcessAmount_099AC27BC5E507AE5758C5B54435F002" xlink:type="arc"/>
<link:label id="lab_efoi_OperatingLeaseReceivable_820BDECB1532EE39EF99C5B54435C0CC_negatedTerseLabel_en-US" xlink:label="lab_efoi_OperatingLeaseReceivable_820BDECB1532EE39EF99C5B54435C0CC" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Total lease obligations </link:label>
<link:label id="lab_efoi_OperatingLeaseReceivable_820BDECB1532EE39EF99C5B54435C0CC_label_en-US" xlink:label="lab_efoi_OperatingLeaseReceivable_820BDECB1532EE39EF99C5B54435C0CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Receivable </link:label>
<link:label id="lab_efoi_OperatingLeaseReceivable_820BDECB1532EE39EF99C5B54435C0CC_documentation_en-US" xlink:label="lab_efoi_OperatingLeaseReceivable_820BDECB1532EE39EF99C5B54435C0CC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Operating Lease, Receivable </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_OperatingLeaseReceivable" xlink:label="loc_efoi_OperatingLeaseReceivable_820BDECB1532EE39EF99C5B54435C0CC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_OperatingLeaseReceivable_820BDECB1532EE39EF99C5B54435C0CC" xlink:to="lab_efoi_OperatingLeaseReceivable_820BDECB1532EE39EF99C5B54435C0CC" xlink:type="arc"/>
<link:label id="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsRollingMaturityAbstract_E8BA8F5CB80BF4D262D2C5B54435DDDB_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsRollingMaturityAbstract_E8BA8F5CB80BF4D262D2C5B54435DDDB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Finance Lease </link:label>
<link:label id="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsRollingMaturityAbstract_E8BA8F5CB80BF4D262D2C5B54435DDDB_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsRollingMaturityAbstract_E8BA8F5CB80BF4D262D2C5B54435DDDB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Payment, Due, Rolling Maturity [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilitiesPaymentsRollingMaturityAbstract" xlink:label="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsRollingMaturityAbstract_E8BA8F5CB80BF4D262D2C5B54435DDDB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsRollingMaturityAbstract_E8BA8F5CB80BF4D262D2C5B54435DDDB" xlink:to="lab_us-gaap_FinanceLeaseLiabilitiesPaymentsRollingMaturityAbstract_E8BA8F5CB80BF4D262D2C5B54435DDDB" xlink:type="arc"/>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths_6F6CF56EA35652FAAE93C5B54436C18F_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths_6F6CF56EA35652FAAE93C5B54436C18F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths_6F6CF56EA35652FAAE93C5B54436C18F_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths_6F6CF56EA35652FAAE93C5B54436C18F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Payments, Due in Next Rolling Twelve Months </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths_6F6CF56EA35652FAAE93C5B54436C18F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths_6F6CF56EA35652FAAE93C5B54436C18F" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths_6F6CF56EA35652FAAE93C5B54436C18F" xlink:type="arc"/>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearTwo_B850A131B772F5FD570CC5B5443659E9_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearTwo_B850A131B772F5FD570CC5B5443659E9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearTwo_B850A131B772F5FD570CC5B5443659E9_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearTwo_B850A131B772F5FD570CC5B5443659E9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Payments, Due in Rolling Year Two </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearTwo" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearTwo_B850A131B772F5FD570CC5B5443659E9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearTwo_B850A131B772F5FD570CC5B5443659E9" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearTwo_B850A131B772F5FD570CC5B5443659E9" xlink:type="arc"/>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearThree_B03189FB64AB50BE0D76C5B54436BA0E_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearThree_B03189FB64AB50BE0D76C5B54436BA0E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearThree_B03189FB64AB50BE0D76C5B54436BA0E_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearThree_B03189FB64AB50BE0D76C5B54436BA0E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Payments, Due in Rolling Year Three </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearThree" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearThree_B03189FB64AB50BE0D76C5B54436BA0E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearThree_B03189FB64AB50BE0D76C5B54436BA0E" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearThree_B03189FB64AB50BE0D76C5B54436BA0E" xlink:type="arc"/>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFour_AFF14799640C87F710BCC5B544366DC7_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFour_AFF14799640C87F710BCC5B544366DC7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFour_AFF14799640C87F710BCC5B544366DC7_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFour_AFF14799640C87F710BCC5B544366DC7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Payments, Due in Rolling Year Four </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFour" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFour_AFF14799640C87F710BCC5B544366DC7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFour_AFF14799640C87F710BCC5B544366DC7" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFour_AFF14799640C87F710BCC5B544366DC7" xlink:type="arc"/>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFive_5D7F92432268C9677D48C5B54437423A_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFive_5D7F92432268C9677D48C5B54437423A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2024 </link:label>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFive_5D7F92432268C9677D48C5B54437423A_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFive_5D7F92432268C9677D48C5B54437423A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Payments, Due in Rolling Year Five </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFive" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFive_5D7F92432268C9677D48C5B54437423A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFive_5D7F92432268C9677D48C5B54437423A" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDueInRollingYearFive_5D7F92432268C9677D48C5B54437423A" xlink:type="arc"/>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_327C1CAA7DE3050D3BF1C5B544373B3C_totalLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_327C1CAA7DE3050D3BF1C5B544373B3C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total future undiscounted lease payments </link:label>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_327C1CAA7DE3050D3BF1C5B544373B3C_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_327C1CAA7DE3050D3BF1C5B544373B3C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Payment, Due </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_327C1CAA7DE3050D3BF1C5B544373B3C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_327C1CAA7DE3050D3BF1C5B544373B3C" xlink:to="lab_us-gaap_FinanceLeaseLiabilityPaymentsDue_327C1CAA7DE3050D3BF1C5B544373B3C" xlink:type="arc"/>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_BE70C1AB666F6A1C3921C5B54437E0C1_negatedLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_BE70C1AB666F6A1C3921C5B54437E0C1" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Less imputed interest </link:label>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_BE70C1AB666F6A1C3921C5B54437E0C1_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_BE70C1AB666F6A1C3921C5B54437E0C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Undiscounted Excess Amount </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_BE70C1AB666F6A1C3921C5B54437E0C1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_BE70C1AB666F6A1C3921C5B54437E0C1" xlink:to="lab_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_BE70C1AB666F6A1C3921C5B54437E0C1" xlink:type="arc"/>
<link:label id="lab_us-gaap_FinanceLeaseLiability_27956C415F59A6364302C5B54437355E_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiability_27956C415F59A6364302C5B54437355E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total lease obligations </link:label>
<link:label id="lab_us-gaap_FinanceLeaseLiability_27956C415F59A6364302C5B54437355E_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiability_27956C415F59A6364302C5B54437355E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiability" xlink:label="loc_us-gaap_FinanceLeaseLiability_27956C415F59A6364302C5B54437355E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_28BC57C035A70309005BE45CD644C9BA_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_28BC57C035A70309005BE45CD644C9BA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] </link:label>
<link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_28BC57C035A70309005BE45CD644C9BA_label_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_28BC57C035A70309005BE45CD644C9BA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_28BC57C035A70309005BE45CD644C9BA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PlanNameAxis_D193C669360865B8E297E45CD6469B36_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameAxis_D193C669360865B8E297E45CD6469B36" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Plan Name [Axis] </link:label>
<link:label id="lab_us-gaap_PlanNameAxis_D193C669360865B8E297E45CD6469B36_label_en-US" xlink:label="lab_us-gaap_PlanNameAxis_D193C669360865B8E297E45CD6469B36" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Plan Name [Axis] </link:label>
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<link:label id="lab_us-gaap_PlanNameDomain_4584E086B94FAE3D3F3BE45CD646929E_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameDomain_4584E086B94FAE3D3F3BE45CD646929E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Plan Name [Domain] </link:label>
<link:label id="lab_us-gaap_PlanNameDomain_4584E086B94FAE3D3F3BE45CD646929E_label_en-US" xlink:label="lab_us-gaap_PlanNameDomain_4584E086B94FAE3D3F3BE45CD646929E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Plan Name [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_4584E086B94FAE3D3F3BE45CD646929E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PlanNameDomain_4584E086B94FAE3D3F3BE45CD646929E" xlink:to="lab_us-gaap_PlanNameDomain_4584E086B94FAE3D3F3BE45CD646929E" xlink:type="arc"/>
<link:label id="lab_efoi_Plan2014Member_D70888D86BE34B306E75E45CD647D3FB_terseLabel_en-US" xlink:label="lab_efoi_Plan2014Member_D70888D86BE34B306E75E45CD647D3FB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2014 Plan </link:label>
<link:label id="lab_efoi_Plan2014Member_D70888D86BE34B306E75E45CD647D3FB_label_en-US" xlink:label="lab_efoi_Plan2014Member_D70888D86BE34B306E75E45CD647D3FB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Plan 2014 [Member] </link:label>
<link:label id="lab_efoi_Plan2014Member_D70888D86BE34B306E75E45CD647D3FB_documentation_en-US" xlink:label="lab_efoi_Plan2014Member_D70888D86BE34B306E75E45CD647D3FB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Stock incentive plan approved in 2014. </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_Plan2014Member" xlink:label="loc_efoi_Plan2014Member_D70888D86BE34B306E75E45CD647D3FB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_Plan2014Member_D70888D86BE34B306E75E45CD647D3FB" xlink:to="lab_efoi_Plan2014Member_D70888D86BE34B306E75E45CD647D3FB" xlink:type="arc"/>
<link:label id="lab_us-gaap_AwardTypeAxis_C6A9C90844C412CCBE72E45CD648640B_terseLabel_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_C6A9C90844C412CCBE72E45CD648640B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Award Type [Axis] </link:label>
<link:label id="lab_us-gaap_AwardTypeAxis_C6A9C90844C412CCBE72E45CD648640B_label_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_C6A9C90844C412CCBE72E45CD648640B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Award Type [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_C6A9C90844C412CCBE72E45CD648640B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3F06A5AA5A182460AB2FE45CD648261B_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3F06A5AA5A182460AB2FE45CD648261B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Award Type [Domain] </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3F06A5AA5A182460AB2FE45CD648261B_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3F06A5AA5A182460AB2FE45CD648261B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Award Type [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3F06A5AA5A182460AB2FE45CD648261B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_WarrantMember_8CB0816E5A84E89D3AF7E45CD648CABA_terseLabel_en-US" xlink:label="lab_us-gaap_WarrantMember_8CB0816E5A84E89D3AF7E45CD648CABA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Warrant </link:label>
<link:label id="lab_us-gaap_WarrantMember_8CB0816E5A84E89D3AF7E45CD648CABA_label_en-US" xlink:label="lab_us-gaap_WarrantMember_8CB0816E5A84E89D3AF7E45CD648CABA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Warrant [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WarrantMember" xlink:label="loc_us-gaap_WarrantMember_8CB0816E5A84E89D3AF7E45CD648CABA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WarrantMember_8CB0816E5A84E89D3AF7E45CD648CABA" xlink:to="lab_us-gaap_WarrantMember_8CB0816E5A84E89D3AF7E45CD648CABA" xlink:type="arc"/>
<link:label id="lab_us-gaap_RestrictedStockMember_34813034C97B6E022956E45CD64953D3_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockMember_34813034C97B6E022956E45CD64953D3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restricted stock </link:label>
<link:label id="lab_us-gaap_RestrictedStockMember_34813034C97B6E022956E45CD64953D3_label_en-US" xlink:label="lab_us-gaap_RestrictedStockMember_34813034C97B6E022956E45CD64953D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restricted Stock [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_34813034C97B6E022956E45CD64953D3" xlink:type="locator"/>
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<link:label id="lab_us-gaap_EmployeeStockOptionMember_1666E4BF6AC1652D9810E45CD6493DF0_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeStockOptionMember_1666E4BF6AC1652D9810E45CD6493DF0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Employee stock option </link:label>
<link:label id="lab_us-gaap_EmployeeStockOptionMember_1666E4BF6AC1652D9810E45CD6493DF0_label_en-US" xlink:label="lab_us-gaap_EmployeeStockOptionMember_1666E4BF6AC1652D9810E45CD6493DF0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Option [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_1666E4BF6AC1652D9810E45CD6493DF0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RestrictedStockUnitsRSUMember_BD3E1917DC63A38E066BE45CD64923BD_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockUnitsRSUMember_BD3E1917DC63A38E066BE45CD64923BD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restricted Stock Units (RSUs) </link:label>
<link:label id="lab_us-gaap_RestrictedStockUnitsRSUMember_BD3E1917DC63A38E066BE45CD64923BD_label_en-US" xlink:label="lab_us-gaap_RestrictedStockUnitsRSUMember_BD3E1917DC63A38E066BE45CD64923BD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restricted Stock Units (RSUs) [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_BD3E1917DC63A38E066BE45CD64923BD" xlink:type="locator"/>
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<link:label id="lab_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_FBAD2C2FC361B571B3F8E45CD64AC9C4_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_FBAD2C2FC361B571B3F8E45CD64AC9C4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Employee Stock Ownership Plan (ESOP) Name [Axis] </link:label>
<link:label id="lab_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_FBAD2C2FC361B571B3F8E45CD64AC9C4_label_en-US" xlink:label="lab_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_FBAD2C2FC361B571B3F8E45CD64AC9C4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Employee Stock Ownership Plan (ESOP) Name [Axis] </link:label>
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<link:label id="lab_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_08DD19EB0D3880C6E760E45CD64A4545_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_08DD19EB0D3880C6E760E45CD64A4545" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Employee Stock Ownership Plan (ESOP), Plan [Domain] </link:label>
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<link:label id="lab_efoi_EmployeeStockPurchasePlan2013Member_FDF1E3F7558E08E1813BE45CD64A54DB_terseLabel_en-US" xlink:label="lab_efoi_EmployeeStockPurchasePlan2013Member_FDF1E3F7558E08E1813BE45CD64A54DB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2013 Plan </link:label>
<link:label id="lab_efoi_EmployeeStockPurchasePlan2013Member_FDF1E3F7558E08E1813BE45CD64A54DB_label_en-US" xlink:label="lab_efoi_EmployeeStockPurchasePlan2013Member_FDF1E3F7558E08E1813BE45CD64A54DB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Employee Stock Purchase Plan 2013 [Member] </link:label>
<link:label id="lab_efoi_EmployeeStockPurchasePlan2013Member_FDF1E3F7558E08E1813BE45CD64A54DB_documentation_en-US" xlink:label="lab_efoi_EmployeeStockPurchasePlan2013Member_FDF1E3F7558E08E1813BE45CD64A54DB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Information related to the employee stock purchase plan approved in 2013. </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_EmployeeStockPurchasePlan2013Member" xlink:label="loc_efoi_EmployeeStockPurchasePlan2013Member_FDF1E3F7558E08E1813BE45CD64A54DB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_912DA3B0A1613858C456E45CD64B1D12_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_912DA3B0A1613858C456E45CD64B1D12" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award [Line Items] </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_912DA3B0A1613858C456E45CD64B1D12" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures_8D6E0BB7BCB2D20D3CCBE45CD64B242A_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures_8D6E0BB7BCB2D20D3CCBE45CD64B242A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Warrants canceled/forfeited (in shares) </link:label>
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<link:label id="lab_efoi_ClassOfWarrantOrRightWarrantsIssued_265DA797A458BC448E1BE45CD650197B_terseLabel_en-US" xlink:label="lab_efoi_ClassOfWarrantOrRightWarrantsIssued_265DA797A458BC448E1BE45CD650197B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of warrants issued (in shares) </link:label>
<link:label id="lab_efoi_ClassOfWarrantOrRightWarrantsIssued_265DA797A458BC448E1BE45CD650197B_label_en-US" xlink:label="lab_efoi_ClassOfWarrantOrRightWarrantsIssued_265DA797A458BC448E1BE45CD650197B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class Of Warrant Or Right, Warrants Issued </link:label>
<link:label id="lab_efoi_ClassOfWarrantOrRightWarrantsIssued_265DA797A458BC448E1BE45CD650197B_documentation_en-US" xlink:label="lab_efoi_ClassOfWarrantOrRightWarrantsIssued_265DA797A458BC448E1BE45CD650197B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Class Of Warrant Or Right, Warrants Issued </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_ClassOfWarrantOrRightWarrantsIssued" xlink:label="loc_efoi_ClassOfWarrantOrRightWarrantsIssued_265DA797A458BC448E1BE45CD650197B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_8883E9489487943F9A58E45CD651607C_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_8883E9489487943F9A58E45CD651607C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Exercise price of warrants (in dollars per share) </link:label>
<link:label id="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_8883E9489487943F9A58E45CD651607C_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_8883E9489487943F9A58E45CD651607C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Warrant or Right, Exercise Price of Warrants or Rights </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_8883E9489487943F9A58E45CD651607C" xlink:type="locator"/>
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<link:label id="lab_efoi_ClassOfWarrantOrRightPurchasePriceOfWarrantsOrRights_A1D0FDAEB2D049F35917E45CD651AD77_terseLabel_en-US" xlink:label="lab_efoi_ClassOfWarrantOrRightPurchasePriceOfWarrantsOrRights_A1D0FDAEB2D049F35917E45CD651AD77" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Purchase price (in dollars per share) </link:label>
<link:label id="lab_efoi_ClassOfWarrantOrRightPurchasePriceOfWarrantsOrRights_A1D0FDAEB2D049F35917E45CD651AD77_label_en-US" xlink:label="lab_efoi_ClassOfWarrantOrRightPurchasePriceOfWarrantsOrRights_A1D0FDAEB2D049F35917E45CD651AD77" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class Of Warrant Or Right, Purchase Price Of Warrants Or Rights </link:label>
<link:label id="lab_efoi_ClassOfWarrantOrRightPurchasePriceOfWarrantsOrRights_A1D0FDAEB2D049F35917E45CD651AD77_documentation_en-US" xlink:label="lab_efoi_ClassOfWarrantOrRightPurchasePriceOfWarrantsOrRights_A1D0FDAEB2D049F35917E45CD651AD77" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Class Of Warrant Or Right, Purchase Price Of Warrants Or Rights </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_ClassOfWarrantOrRightPurchasePriceOfWarrantsOrRights" xlink:label="loc_efoi_ClassOfWarrantOrRightPurchasePriceOfWarrantsOrRights_A1D0FDAEB2D049F35917E45CD651AD77" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_84E0DB0DE6B60D8EB7FAE45CD651ABA0_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_84E0DB0DE6B60D8EB7FAE45CD651ABA0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of shares authorized (in shares) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_84E0DB0DE6B60D8EB7FAE45CD651ABA0_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_84E0DB0DE6B60D8EB7FAE45CD651ABA0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_84E0DB0DE6B60D8EB7FAE45CD651ABA0" xlink:type="locator"/>
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<link:label id="lab_efoi_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofAdditionalOtherEquityBasedPlans_38B4211C5A6936546656E45CD652BC0A_terseLabel_en-US" xlink:label="lab_efoi_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofAdditionalOtherEquityBasedPlans_38B4211C5A6936546656E45CD652BC0A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of additional other equity-based plans </link:label>
<link:label id="lab_efoi_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofAdditionalOtherEquityBasedPlans_38B4211C5A6936546656E45CD652BC0A_label_en-US" xlink:label="lab_efoi_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofAdditionalOtherEquityBasedPlans_38B4211C5A6936546656E45CD652BC0A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Other Equity-Based Plans </link:label>
<link:label id="lab_efoi_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofAdditionalOtherEquityBasedPlans_38B4211C5A6936546656E45CD652BC0A_documentation_en-US" xlink:label="lab_efoi_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofAdditionalOtherEquityBasedPlans_38B4211C5A6936546656E45CD652BC0A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Other Equity-Based Plans </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofAdditionalOtherEquityBasedPlans" xlink:label="loc_efoi_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofAdditionalOtherEquityBasedPlans_38B4211C5A6936546656E45CD652BC0A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A4EFEC8567D7661D54B7E45CD65261DF_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A4EFEC8567D7661D54B7E45CD65261DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vesting period </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A4EFEC8567D7661D54B7E45CD65261DF_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A4EFEC8567D7661D54B7E45CD65261DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A4EFEC8567D7661D54B7E45CD65261DF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A4EFEC8567D7661D54B7E45CD65261DF" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A4EFEC8567D7661D54B7E45CD65261DF" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_032655CAEBC18175C17FE45CD6521C19_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_032655CAEBC18175C17FE45CD6521C19" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of shares available for grant (in shares) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_032655CAEBC18175C17FE45CD6521C19_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_032655CAEBC18175C17FE45CD6521C19" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_032655CAEBC18175C17FE45CD6521C19" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_032655CAEBC18175C17FE45CD6521C19" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_032655CAEBC18175C17FE45CD6521C19" xlink:type="arc"/>
<link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_7BE1AAA4E24C65806F67E45CD6527DE6_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_7BE1AAA4E24C65806F67E45CD6527DE6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Unamortized stock compensation expense </link:label>
<link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_7BE1AAA4E24C65806F67E45CD6527DE6_label_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_7BE1AAA4E24C65806F67E45CD6527DE6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_7BE1AAA4E24C65806F67E45CD6527DE6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_6066C463317AB8FD776EE45CD653F309_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_6066C463317AB8FD776EE45CD653F309" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Exercised (in shares) </link:label>
<link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_6066C463317AB8FD776EE45CD653F309_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_6066C463317AB8FD776EE45CD653F309" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_D553F917C8AD0CB0D363E45CD6535405_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_D553F917C8AD0CB0D363E45CD6535405" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Intrinsic value of options outstanding </link:label>
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<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_1A82F711E52162B46DB5E45CD6537C9F_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_1A82F711E52162B46DB5E45CD6537C9F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Intrinsic value of options exercisable </link:label>
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<link:label id="lab_us-gaap_SharePrice_79CF6C2AE952951DBF60E461E95BD4E6_terseLabel_en-US" xlink:label="lab_us-gaap_SharePrice_79CF6C2AE952951DBF60E461E95BD4E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Share Price </link:label>
<link:label id="lab_us-gaap_SharePrice_79CF6C2AE952951DBF60E461E95BD4E6_label_en-US" xlink:label="lab_us-gaap_SharePrice_79CF6C2AE952951DBF60E461E95BD4E6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share Price </link:label>
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<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_1E0EF1BAD8FF829371F2E45CD653D66B_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_1E0EF1BAD8FF829371F2E45CD653D66B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Purchase price of common stock, percent </link:label>
<link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_1E0EF1BAD8FF829371F2E45CD653D66B_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_1E0EF1BAD8FF829371F2E45CD653D66B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_1E0EF1BAD8FF829371F2E45CD653D66B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_B0B8BB424ABC882D736AE45CD6536252_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_B0B8BB424ABC882D736AE45CD6536252" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Shares issued in the period (in shares) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_B0B8BB424ABC882D736AE45CD6536252_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_B0B8BB424ABC882D736AE45CD6536252" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_B0B8BB424ABC882D736AE45CD6536252" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_87B9698FC83F14799327D69AF0615039_terseLabel_en-US" xlink:label="lab_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_87B9698FC83F14799327D69AF0615039" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current: </link:label>
<link:label id="lab_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_87B9698FC83F14799327D69AF0615039_label_en-US" xlink:label="lab_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_87B9698FC83F14799327D69AF0615039" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Current Income Tax Expense (Benefit), Continuing Operations [Abstract] </link:label>
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<link:label id="lab_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_DC8B702BF22C98AF16EFD69AF06130D9_terseLabel_en-US" xlink:label="lab_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_DC8B702BF22C98AF16EFD69AF06130D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> State </link:label>
<link:label id="lab_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_DC8B702BF22C98AF16EFD69AF06130D9_label_en-US" xlink:label="lab_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_DC8B702BF22C98AF16EFD69AF06130D9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Current State and Local Tax Expense (Benefit) </link:label>
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<link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_37E474D4D604D7BE5FD3D69AF0657AE0_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_37E474D4D604D7BE5FD3D69AF0657AE0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred: </link:label>
<link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_37E474D4D604D7BE5FD3D69AF0657AE0_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_37E474D4D604D7BE5FD3D69AF0657AE0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_37E474D4D604D7BE5FD3D69AF0657AE0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_184DED566DFDC7520893D69AF0659CBE_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_184DED566DFDC7520893D69AF0659CBE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> U.S. Federal </link:label>
<link:label id="lab_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_184DED566DFDC7520893D69AF0659CBE_label_en-US" xlink:label="lab_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_184DED566DFDC7520893D69AF0659CBE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Federal Income Tax Expense (Benefit) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_184DED566DFDC7520893D69AF0659CBE" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_BAF02D3EBA2412428A24D69AF065CD1B_totalLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_BAF02D3EBA2412428A24D69AF065CD1B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Provision for (benefit from) income taxes </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_BAF02D3EBA2412428A24D69AF065CD1B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccruedProfessionalFeesCurrent_1D918525DBCB9F35727CC5B543E572AC_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedProfessionalFeesCurrent_1D918525DBCB9F35727CC5B543E572AC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued legal and professional fees </link:label>
<link:label id="lab_us-gaap_AccruedProfessionalFeesCurrent_1D918525DBCB9F35727CC5B543E572AC_label_en-US" xlink:label="lab_us-gaap_AccruedProfessionalFeesCurrent_1D918525DBCB9F35727CC5B543E572AC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Professional Fees, Current </link:label>
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<link:label id="lab_us-gaap_AccruedEmployeeBenefitsCurrent_FB11166C32BE435DD1B4C5B543E53FAF_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedEmployeeBenefitsCurrent_FB11166C32BE435DD1B4C5B543E53FAF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued payroll and related benefits </link:label>
<link:label id="lab_us-gaap_AccruedEmployeeBenefitsCurrent_FB11166C32BE435DD1B4C5B543E53FAF_label_en-US" xlink:label="lab_us-gaap_AccruedEmployeeBenefitsCurrent_FB11166C32BE435DD1B4C5B543E53FAF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Employee Benefits, Current </link:label>
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<link:label id="lab_us-gaap_AccruedSalesCommissionCurrent_44EDEB90FDDCB853E1D8C5B543E6174C_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedSalesCommissionCurrent_44EDEB90FDDCB853E1D8C5B543E6174C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued sales commissions </link:label>
<link:label id="lab_us-gaap_AccruedSalesCommissionCurrent_44EDEB90FDDCB853E1D8C5B543E6174C_label_en-US" xlink:label="lab_us-gaap_AccruedSalesCommissionCurrent_44EDEB90FDDCB853E1D8C5B543E6174C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Sales Commission, Current </link:label>
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<link:label id="lab_us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits_677740E945C4BBD6D284C5B543E6A8CB_terseLabel_en-US" xlink:label="lab_us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits_677740E945C4BBD6D284C5B543E6A8CB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued severance </link:label>
<link:label id="lab_us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits_677740E945C4BBD6D284C5B543E6A8CB_label_en-US" xlink:label="lab_us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits_677740E945C4BBD6D284C5B543E6A8CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Supplemental Unemployment Benefits, Severance Benefits </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits" xlink:label="loc_us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits_677740E945C4BBD6D284C5B543E6A8CB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RestructuringReserveCurrent_1040860DDD62A58F7785C5B543E69651_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringReserveCurrent_1040860DDD62A58F7785C5B543E69651" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued restructuring </link:label>
<link:label id="lab_us-gaap_RestructuringReserveCurrent_1040860DDD62A58F7785C5B543E69651_label_en-US" xlink:label="lab_us-gaap_RestructuringReserveCurrent_1040860DDD62A58F7785C5B543E69651" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructuring Reserve, Current </link:label>
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<link:label id="lab_us-gaap_StandardProductWarrantyAccrualCurrent_55CEAB05B548F7DC1781C5B543E6B91F_terseLabel_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyAccrualCurrent_55CEAB05B548F7DC1781C5B543E6B91F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued warranty reserve </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StandardProductWarrantyAccrualCurrent" xlink:label="loc_us-gaap_StandardProductWarrantyAccrualCurrent_55CEAB05B548F7DC1781C5B543E6B91F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherAccruedLiabilitiesCurrent_61C2953E1D4F2AC935BCC5B543E614B5_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAccruedLiabilitiesCurrent_61C2953E1D4F2AC935BCC5B543E614B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued liabilities </link:label>
<link:label id="lab_us-gaap_OtherAccruedLiabilitiesCurrent_61C2953E1D4F2AC935BCC5B543E614B5_label_en-US" xlink:label="lab_us-gaap_OtherAccruedLiabilitiesCurrent_61C2953E1D4F2AC935BCC5B543E614B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Accrued Liabilities, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_61C2953E1D4F2AC935BCC5B543E614B5" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_A27D6EB7EAB06A55C227C5B543E6CE61_totalLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_A27D6EB7EAB06A55C227C5B543E6CE61" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total accrued liabilities </link:label>
<link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_A27D6EB7EAB06A55C227C5B543E6CE61_label_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_A27D6EB7EAB06A55C227C5B543E6CE61" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Liabilities, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_A27D6EB7EAB06A55C227C5B543E6CE61" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_A0537E9358296968D36FC5462E971B96_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_A0537E9358296968D36FC5462E971B96" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Commitments and Contingencies Disclosure [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_A0537E9358296968D36FC5462E971B96" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LegalMattersAndContingenciesTextBlock_D1558D46EF4848C89891C5462E97E38A_terseLabel_en-US" xlink:label="lab_us-gaap_LegalMattersAndContingenciesTextBlock_D1558D46EF4848C89891C5462E97E38A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Legal Matters </link:label>
<link:label id="lab_us-gaap_LegalMattersAndContingenciesTextBlock_D1558D46EF4848C89891C5462E97E38A_label_en-US" xlink:label="lab_us-gaap_LegalMattersAndContingenciesTextBlock_D1558D46EF4848C89891C5462E97E38A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Legal Matters and Contingencies [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LegalMattersAndContingenciesTextBlock" xlink:label="loc_us-gaap_LegalMattersAndContingenciesTextBlock_D1558D46EF4848C89891C5462E97E38A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeasePayments_27FEDE1CD9E070CECBCADE2186EBAE55_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments_27FEDE1CD9E070CECBCADE2186EBAE55" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating cash flows from operating leases </link:label>
<link:label id="lab_us-gaap_OperatingLeasePayments_27FEDE1CD9E070CECBCADE2186EBAE55_label_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments_27FEDE1CD9E070CECBCADE2186EBAE55" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Payments </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasePayments" xlink:label="loc_us-gaap_OperatingLeasePayments_27FEDE1CD9E070CECBCADE2186EBAE55" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasePayments_27FEDE1CD9E070CECBCADE2186EBAE55" xlink:to="lab_us-gaap_OperatingLeasePayments_27FEDE1CD9E070CECBCADE2186EBAE55" xlink:type="arc"/>
<link:label id="lab_efoi_RestructuredLeasesOperatingLeasePayments_C215838966D589B7CEC1DE2186EB3381_terseLabel_en-US" xlink:label="lab_efoi_RestructuredLeasesOperatingLeasePayments_C215838966D589B7CEC1DE2186EB3381" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating cash flows from restructured leases </link:label>
<link:label id="lab_efoi_RestructuredLeasesOperatingLeasePayments_C215838966D589B7CEC1DE2186EB3381_label_en-US" xlink:label="lab_efoi_RestructuredLeasesOperatingLeasePayments_C215838966D589B7CEC1DE2186EB3381" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructured Leases, Operating Lease, Payments </link:label>
<link:label id="lab_efoi_RestructuredLeasesOperatingLeasePayments_C215838966D589B7CEC1DE2186EB3381_documentation_en-US" xlink:label="lab_efoi_RestructuredLeasesOperatingLeasePayments_C215838966D589B7CEC1DE2186EB3381" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Restructured Leases, Operating Lease, Payments </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuredLeasesOperatingLeasePayments" xlink:label="loc_efoi_RestructuredLeasesOperatingLeasePayments_C215838966D589B7CEC1DE2186EB3381" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FinanceLeasePrincipalPayments_4A72D0D729391D7BE1CADE2186EBE71A_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeasePrincipalPayments_4A72D0D729391D7BE1CADE2186EBE71A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Financing cash flows from finance leases </link:label>
<link:label id="lab_us-gaap_FinanceLeasePrincipalPayments_4A72D0D729391D7BE1CADE2186EBE71A_label_en-US" xlink:label="lab_us-gaap_FinanceLeasePrincipalPayments_4A72D0D729391D7BE1CADE2186EBE71A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Principal Payments </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeasePrincipalPayments" xlink:label="loc_us-gaap_FinanceLeasePrincipalPayments_4A72D0D729391D7BE1CADE2186EBE71A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SegmentReportingAbstract_3C6903A6CB9C7C2D15F5D69AF0476210_label_en-US" xlink:label="lab_us-gaap_SegmentReportingAbstract_3C6903A6CB9C7C2D15F5D69AF0476210" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Segment Reporting [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentReportingAbstract" xlink:label="loc_us-gaap_SegmentReportingAbstract_3C6903A6CB9C7C2D15F5D69AF0476210" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_D9E0EEED6B18D5A45933D69AF047A8D8_terseLabel_en-US" xlink:label="lab_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_D9E0EEED6B18D5A45933D69AF047A8D8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] </link:label>
<link:label id="lab_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_D9E0EEED6B18D5A45933D69AF047A8D8_label_en-US" xlink:label="lab_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_D9E0EEED6B18D5A45933D69AF047A8D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_D9E0EEED6B18D5A45933D69AF047A8D8" xlink:type="locator"/>
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<link:label id="lab_efoi_PoolAndCommercialProductsMember_EA4E07F600975CE6120AD69AF04B6A9E_verboseLabel_en-US" xlink:label="lab_efoi_PoolAndCommercialProductsMember_EA4E07F600975CE6120AD69AF04B6A9E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Commercial products </link:label>
<link:label id="lab_efoi_PoolAndCommercialProductsMember_EA4E07F600975CE6120AD69AF04B6A9E_label_en-US" xlink:label="lab_efoi_PoolAndCommercialProductsMember_EA4E07F600975CE6120AD69AF04B6A9E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Pool And Commercial Products [Member] </link:label>
<link:label id="lab_efoi_PoolAndCommercialProductsMember_EA4E07F600975CE6120AD69AF04B6A9E_documentation_en-US" xlink:label="lab_efoi_PoolAndCommercialProductsMember_EA4E07F600975CE6120AD69AF04B6A9E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"/>
<link:loc xlink:href="efoi-20191231.xsd#efoi_PoolAndCommercialProductsMember" xlink:label="loc_efoi_PoolAndCommercialProductsMember_EA4E07F600975CE6120AD69AF04B6A9E" xlink:type="locator"/>
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<link:label id="lab_efoi_GovernmentProductsMember_5C637BCCB432DA2BDCF1D69AF04B6653_terseLabel_en-US" xlink:label="lab_efoi_GovernmentProductsMember_5C637BCCB432DA2BDCF1D69AF04B6653" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> MMM products </link:label>
<link:label id="lab_efoi_GovernmentProductsMember_5C637BCCB432DA2BDCF1D69AF04B6653_label_en-US" xlink:label="lab_efoi_GovernmentProductsMember_5C637BCCB432DA2BDCF1D69AF04B6653" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Government Products [Member] </link:label>
<link:label id="lab_efoi_GovernmentProductsMember_5C637BCCB432DA2BDCF1D69AF04B6653_documentation_en-US" xlink:label="lab_efoi_GovernmentProductsMember_5C637BCCB432DA2BDCF1D69AF04B6653" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Government Products segment. </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_GovernmentProductsMember" xlink:label="loc_efoi_GovernmentProductsMember_5C637BCCB432DA2BDCF1D69AF04B6653" xlink:type="locator"/>
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<link:label id="lab_srt_StatementGeographicalAxis_33C209716E94485F23A3D69AF04B2B04_terseLabel_en-US" xlink:label="lab_srt_StatementGeographicalAxis_33C209716E94485F23A3D69AF04B2B04" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Geographical [Axis] </link:label>
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<link:label id="lab_srt_SegmentGeographicalDomain_92642EF57D7D8BE92988D69AF04B0F99_terseLabel_en-US" xlink:label="lab_srt_SegmentGeographicalDomain_92642EF57D7D8BE92988D69AF04B0F99" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Geographical [Domain] </link:label>
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<link:label id="lab_efoi_InternationalMember_595056E0BAC1384B8393D69AF04C09D2_terseLabel_en-US" xlink:label="lab_efoi_InternationalMember_595056E0BAC1384B8393D69AF04C09D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> International </link:label>
<link:label id="lab_efoi_InternationalMember_595056E0BAC1384B8393D69AF04C09D2_label_en-US" xlink:label="lab_efoi_InternationalMember_595056E0BAC1384B8393D69AF04C09D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> International [Member] </link:label>
<link:label id="lab_efoi_InternationalMember_595056E0BAC1384B8393D69AF04C09D2_documentation_en-US" xlink:label="lab_efoi_InternationalMember_595056E0BAC1384B8393D69AF04C09D2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> International </link:label>
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<link:label id="lab_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7F272A971CF41376732BD69AF04C94DA_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7F272A971CF41376732BD69AF04C94DA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] </link:label>
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<link:label id="lab_efoi_LonglivedAssetsLocatedinUSPercent_70322204670BF947920AD69AF04DE0E9_terseLabel_en-US" xlink:label="lab_efoi_LonglivedAssetsLocatedinUSPercent_70322204670BF947920AD69AF04DE0E9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-lived assets located in US, percent </link:label>
<link:label id="lab_efoi_LonglivedAssetsLocatedinUSPercent_70322204670BF947920AD69AF04DE0E9_label_en-US" xlink:label="lab_efoi_LonglivedAssetsLocatedinUSPercent_70322204670BF947920AD69AF04DE0E9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-lived Assets Located in US, Percent </link:label>
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<link:label id="lab_us-gaap_StatementOfStockholdersEquityAbstract_33221AF729496186445FE8C4E89E547B_label_en-US" xlink:label="lab_us-gaap_StatementOfStockholdersEquityAbstract_33221AF729496186445FE8C4E89E547B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Stockholders' Equity [Abstract] </link:label>
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<link:label id="lab_us-gaap_StatementTable_0A2707DED82044ABAA80E8C4E89ED379_terseLabel_en-US" xlink:label="lab_us-gaap_StatementTable_0A2707DED82044ABAA80E8C4E89ED379" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Statement [Table] </link:label>
<link:label id="lab_us-gaap_StatementTable_0A2707DED82044ABAA80E8C4E89ED379_label_en-US" xlink:label="lab_us-gaap_StatementTable_0A2707DED82044ABAA80E8C4E89ED379" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement [Table] </link:label>
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<link:label id="lab_us-gaap_StatementEquityComponentsAxis_35253D6BAEF3CA5380DBE8C4E89EFB97_terseLabel_en-US" xlink:label="lab_us-gaap_StatementEquityComponentsAxis_35253D6BAEF3CA5380DBE8C4E89EFB97" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Equity Components [Axis] </link:label>
<link:label id="lab_us-gaap_StatementEquityComponentsAxis_35253D6BAEF3CA5380DBE8C4E89EFB97_label_en-US" xlink:label="lab_us-gaap_StatementEquityComponentsAxis_35253D6BAEF3CA5380DBE8C4E89EFB97" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equity Components [Axis] </link:label>
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<link:label id="lab_us-gaap_EquityComponentDomain_5A49894E5ACFD04294F5E8C4E89F60A0_terseLabel_en-US" xlink:label="lab_us-gaap_EquityComponentDomain_5A49894E5ACFD04294F5E8C4E89F60A0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Equity Component [Domain] </link:label>
<link:label id="lab_us-gaap_EquityComponentDomain_5A49894E5ACFD04294F5E8C4E89F60A0_label_en-US" xlink:label="lab_us-gaap_EquityComponentDomain_5A49894E5ACFD04294F5E8C4E89F60A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equity Component [Domain] </link:label>
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<link:label id="lab_us-gaap_CommonStockMember_0C963B839518FBBC4DC7E8C4E89F60F9_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockMember_0C963B839518FBBC4DC7E8C4E89F60F9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common Stock </link:label>
<link:label id="lab_us-gaap_CommonStockMember_0C963B839518FBBC4DC7E8C4E89F60F9_label_en-US" xlink:label="lab_us-gaap_CommonStockMember_0C963B839518FBBC4DC7E8C4E89F60F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_0C963B839518FBBC4DC7E8C4E89F60F9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockMember_0C963B839518FBBC4DC7E8C4E89F60F9" xlink:to="lab_us-gaap_CommonStockMember_0C963B839518FBBC4DC7E8C4E89F60F9" xlink:type="arc"/>
<link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_2E29D2274650FA735AC8E8C4E89FD92C_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember_2E29D2274650FA735AC8E8C4E89FD92C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Additional Paid-in Capital </link:label>
<link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_2E29D2274650FA735AC8E8C4E89FD92C_label_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember_2E29D2274650FA735AC8E8C4E89FD92C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Additional Paid-in Capital [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_2E29D2274650FA735AC8E8C4E89FD92C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_2A1577F8869130651E27E8C4E89FF3A6_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_2A1577F8869130651E27E8C4E89FF3A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated Other Comprehensive (Loss) Income </link:label>
<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_2A1577F8869130651E27E8C4E89FF3A6_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_2A1577F8869130651E27E8C4E89FF3A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> AOCI Attributable to Parent [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_2A1577F8869130651E27E8C4E89FF3A6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RetainedEarningsMember_09DA132F51A8637C4DB4E8C4E89F59C0_terseLabel_en-US" xlink:label="lab_us-gaap_RetainedEarningsMember_09DA132F51A8637C4DB4E8C4E89F59C0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated Deficit </link:label>
<link:label id="lab_us-gaap_RetainedEarningsMember_09DA132F51A8637C4DB4E8C4E89F59C0_label_en-US" xlink:label="lab_us-gaap_RetainedEarningsMember_09DA132F51A8637C4DB4E8C4E89F59C0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Retained Earnings [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_09DA132F51A8637C4DB4E8C4E89F59C0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StatementLineItems_E296470F855E195F6761E8C4E8A0F050_terseLabel_en-US" xlink:label="lab_us-gaap_StatementLineItems_E296470F855E195F6761E8C4E8A0F050" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Statement [Line Items] </link:label>
<link:label id="lab_us-gaap_StatementLineItems_E296470F855E195F6761E8C4E8A0F050_label_en-US" xlink:label="lab_us-gaap_StatementLineItems_E296470F855E195F6761E8C4E8A0F050" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement [Line Items] </link:label>
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<link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_553652AAD0D70005657AE8C4E8A0BAE8_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_553652AAD0D70005657AE8C4E8A0BAE8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Stockholders' Equity [Roll Forward] </link:label>
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<link:label id="lab_us-gaap_StockholdersEquity_CEBEC1312E1B78C5ED98E8C4E8A0E451_periodStartLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_CEBEC1312E1B78C5ED98E8C4E8A0E451" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Beginning balance </link:label>
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<link:label id="lab_us-gaap_SharesOutstanding_725E71507EEC899E7A4AE8C4E8A0BCEF_periodStartLabel_en-US" xlink:label="lab_us-gaap_SharesOutstanding_725E71507EEC899E7A4AE8C4E8A0BCEF" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Beginning balance (in shares) </link:label>
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<link:label id="lab_us-gaap_StockholdersEquity_DB6B4ED63C471D20F9D2E8C4E8A25A04_periodEndLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_DB6B4ED63C471D20F9D2E8C4E8A25A04" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Ending balance </link:label>
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<link:label id="lab_us-gaap_SharesOutstanding_43E02D0139F0F833EA84E8C4E8A2AA7B_periodEndLabel_en-US" xlink:label="lab_us-gaap_SharesOutstanding_43E02D0139F0F833EA84E8C4E8A2AA7B" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Ending balance (in shares) </link:label>
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<link:label id="lab_us-gaap_NatureOfOperations_B8D1DF63C16BE0118925C546311D42B7_terseLabel_en-US" xlink:label="lab_us-gaap_NatureOfOperations_B8D1DF63C16BE0118925C546311D42B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Nature of Operations </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_42CDAB07B67D4A94F2BBC5462FA89C8F_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_42CDAB07B67D4A94F2BBC5462FA89C8F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair value of options issued (in dollars per share) </link:label>
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<link:label id="lab_srt_ValuationAndQualifyingAccountsDisclosureTable_606E1478CFD3149C7CBCC5462E331125_label_en-US" xlink:label="lab_srt_ValuationAndQualifyingAccountsDisclosureTable_606E1478CFD3149C7CBCC5462E331125" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_62DBF04AD88DDC4C3BFEC5462E33DBA5" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ValuationAllowancesAndReservesDomain_FF2776C58A7072D7DF81C5462E34B931_terseLabel_en-US" xlink:label="lab_us-gaap_ValuationAllowancesAndReservesDomain_FF2776C58A7072D7DF81C5462E34B931" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] </link:label>
<link:label id="lab_us-gaap_ValuationAllowancesAndReservesDomain_FF2776C58A7072D7DF81C5462E34B931_label_en-US" xlink:label="lab_us-gaap_ValuationAllowancesAndReservesDomain_FF2776C58A7072D7DF81C5462E34B931" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] </link:label>
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<link:label id="lab_us-gaap_AllowanceForCreditLossMember_343BC869E52AC9508F06C5462E345357_terseLabel_en-US" xlink:label="lab_us-gaap_AllowanceForCreditLossMember_343BC869E52AC9508F06C5462E345357" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Allowance for doubtful accounts and returns </link:label>
<link:label id="lab_us-gaap_AllowanceForCreditLossMember_343BC869E52AC9508F06C5462E345357_label_en-US" xlink:label="lab_us-gaap_AllowanceForCreditLossMember_343BC869E52AC9508F06C5462E345357" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> SEC Schedule, 12-09, Allowance, Credit Loss [Member] </link:label>
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<link:label id="lab_us-gaap_InventoryValuationReserveMember_9BF1975C9F8D40A92B2AC5462E34386B_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryValuationReserveMember_9BF1975C9F8D40A92B2AC5462E34386B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Reserve for excess, obsolete, and slow moving inventories </link:label>
<link:label id="lab_us-gaap_InventoryValuationReserveMember_9BF1975C9F8D40A92B2AC5462E34386B_label_en-US" xlink:label="lab_us-gaap_InventoryValuationReserveMember_9BF1975C9F8D40A92B2AC5462E34386B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> SEC Schedule, 12-09, Reserve, Inventory [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryValuationReserveMember" xlink:label="loc_us-gaap_InventoryValuationReserveMember_9BF1975C9F8D40A92B2AC5462E34386B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_CFC47E09CE898F55729BC5462E34AC58_terseLabel_en-US" xlink:label="lab_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_CFC47E09CE898F55729BC5462E34AC58" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Valuation allowance for deferred tax assets </link:label>
<link:label id="lab_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_CFC47E09CE898F55729BC5462E34AC58_label_en-US" xlink:label="lab_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_CFC47E09CE898F55729BC5462E34AC58" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember" xlink:label="loc_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_CFC47E09CE898F55729BC5462E34AC58" xlink:type="locator"/>
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<link:label id="lab_srt_ValuationAndQualifyingAccountsDisclosureLineItems_1DA396BA747B950E048CC5462E343939_label_en-US" xlink:label="lab_srt_ValuationAndQualifyingAccountsDisclosureLineItems_1DA396BA747B950E048CC5462E343939" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] </link:label>
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<link:label id="lab_us-gaap_MovementInValuationAllowancesAndReservesRollForward_150918BFCEDE081C5130C5462E34C62A_terseLabel_en-US" xlink:label="lab_us-gaap_MovementInValuationAllowancesAndReservesRollForward_150918BFCEDE081C5130C5462E34C62A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] </link:label>
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<link:label id="lab_us-gaap_ValuationAllowancesAndReservesBalance_FEFFC1B014F8C8EAEEA8C5462E3B6E0E_periodEndLabel_en-US" xlink:label="lab_us-gaap_ValuationAllowancesAndReservesBalance_FEFFC1B014F8C8EAEEA8C5462E3B6E0E" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Ending Balance </link:label>
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<link:label id="lab_us-gaap_RestructuringAndRelatedActivitiesAbstract_AA16D02DC493C2A891EB07CE9C33693A_label_en-US" xlink:label="lab_us-gaap_RestructuringAndRelatedActivitiesAbstract_AA16D02DC493C2A891EB07CE9C33693A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructuring and Related Activities [Abstract] </link:label>
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<link:label id="lab_us-gaap_RestructuringCostAndReserveLineItems_1AD20FBA3BA3F6B6EAD107CE9C3CDCD8_label_en-US" xlink:label="lab_us-gaap_RestructuringCostAndReserveLineItems_1AD20FBA3BA3F6B6EAD107CE9C3CDCD8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructuring Cost and Reserve [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_1AD20FBA3BA3F6B6EAD107CE9C3CDCD8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RestructuringReserveRollForward_64163A0D107FAF24E7F007CE9C3C8D01_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringReserveRollForward_64163A0D107FAF24E7F007CE9C3C8D01" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restructuring Reserve [Roll Forward] </link:label>
<link:label id="lab_us-gaap_RestructuringReserveRollForward_64163A0D107FAF24E7F007CE9C3C8D01_label_en-US" xlink:label="lab_us-gaap_RestructuringReserveRollForward_64163A0D107FAF24E7F007CE9C3C8D01" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructuring Reserve [Roll Forward] </link:label>
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<link:label id="lab_efoi_RestructuringReserveAccretion_BB90E506F3438B1C8FF207CE9C3C3669_terseLabel_en-US" xlink:label="lab_efoi_RestructuringReserveAccretion_BB90E506F3438B1C8FF207CE9C3C3669" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accretion of lease obligations </link:label>
<link:label id="lab_efoi_RestructuringReserveAccretion_BB90E506F3438B1C8FF207CE9C3C3669_label_en-US" xlink:label="lab_efoi_RestructuringReserveAccretion_BB90E506F3438B1C8FF207CE9C3C3669" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructuring Reserve, Accretion </link:label>
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<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuringReserveAccretion" xlink:label="loc_efoi_RestructuringReserveAccretion_BB90E506F3438B1C8FF207CE9C3C3669" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PaymentsForRestructuring_AAAACCE6AEC3889FDFE407CE9C3C6E3D_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForRestructuring_AAAACCE6AEC3889FDFE407CE9C3C6E3D" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Payments </link:label>
<link:label id="lab_us-gaap_PaymentsForRestructuring_AAAACCE6AEC3889FDFE407CE9C3C6E3D_label_en-US" xlink:label="lab_us-gaap_PaymentsForRestructuring_AAAACCE6AEC3889FDFE407CE9C3C6E3D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments for Restructuring </link:label>
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<link:label id="lab_us-gaap_RestructuringReserve_67BA609A16EFA3C1241507CE9C4084A4_periodEndLabel_en-US" xlink:label="lab_us-gaap_RestructuringReserve_67BA609A16EFA3C1241507CE9C4084A4" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Ending balance </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="loc_us-gaap_RestructuringReserve_67BA609A16EFA3C1241507CE9C4084A4" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RestructuringReserve_3BA7A3803968BA44B06D07CE9C40F8EC_totalLabel_en-US" xlink:label="lab_us-gaap_RestructuringReserve_3BA7A3803968BA44B06D07CE9C40F8EC" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Restructuring liability </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="loc_us-gaap_RestructuringReserve_3BA7A3803968BA44B06D07CE9C40F8EC" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RestructuringReserveCurrent_7F600FEFB887CE78E89407CE9C40E46E_verboseLabel_en-US" xlink:label="lab_us-gaap_RestructuringReserveCurrent_7F600FEFB887CE78E89407CE9C40E46E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Less, short-term restructuring liability </link:label>
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<link:label id="lab_us-gaap_SegmentReportingDisclosureTextBlock_553AF01C1E9B867E3E07C5462EDC0388_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentReportingDisclosureTextBlock_553AF01C1E9B867E3E07C5462EDC0388" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Product and Geographic Information </link:label>
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<link:label id="lab_us-gaap_InventoryFinishedGoods_41BC11D3E256C515A0AECB909F40E316_label_en-US" xlink:label="lab_us-gaap_InventoryFinishedGoods_41BC11D3E256C515A0AECB909F40E316" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, Finished Goods, Gross </link:label>
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<link:label id="lab_us-gaap_InventoryNet_390B8A6056D973EE1C97CB909F401597_totalLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_390B8A6056D973EE1C97CB909F401597" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Inventories, net </link:label>
<link:label id="lab_us-gaap_InventoryNet_390B8A6056D973EE1C97CB909F401597_label_en-US" xlink:label="lab_us-gaap_InventoryNet_390B8A6056D973EE1C97CB909F401597" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, Net </link:label>
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<link:label id="lab_efoi_IncreaseDecreaseinInventoriesGross_C36CA03545DAC3AF1668CB909F40C84D_negatedTerseLabel_en-US" xlink:label="lab_efoi_IncreaseDecreaseinInventoriesGross_C36CA03545DAC3AF1668CB909F40C84D" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Decrease in gross inventory levels </link:label>
<link:label id="lab_efoi_IncreaseDecreaseinInventoriesGross_C36CA03545DAC3AF1668CB909F40C84D_label_en-US" xlink:label="lab_efoi_IncreaseDecreaseinInventoriesGross_C36CA03545DAC3AF1668CB909F40C84D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Inventories, Gross </link:label>
<link:label id="lab_efoi_IncreaseDecreaseinInventoriesGross_C36CA03545DAC3AF1668CB909F40C84D_documentation_en-US" xlink:label="lab_efoi_IncreaseDecreaseinInventoriesGross_C36CA03545DAC3AF1668CB909F40C84D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Inventories, Gross </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_IncreaseDecreaseinInventoriesGross" xlink:label="loc_efoi_IncreaseDecreaseinInventoriesGross_C36CA03545DAC3AF1668CB909F40C84D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_QuarterlyFinancialInformationTextBlock_2F2A7C6497C624A5100FC5462E5C41F0_terseLabel_en-US" xlink:label="lab_us-gaap_QuarterlyFinancialInformationTextBlock_2F2A7C6497C624A5100FC5462E5C41F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Supplementary Financial Information to Item 8. </link:label>
<link:label id="lab_us-gaap_QuarterlyFinancialInformationTextBlock_2F2A7C6497C624A5100FC5462E5C41F0_label_en-US" xlink:label="lab_us-gaap_QuarterlyFinancialInformationTextBlock_2F2A7C6497C624A5100FC5462E5C41F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Quarterly Financial Information [Text Block] </link:label>
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<link:label id="lab_us-gaap_EmployeeSeveranceMember_D45A3FB5527FBA9A71E707CE9C56D674_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeSeveranceMember_D45A3FB5527FBA9A71E707CE9C56D674" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Severance and Related Benefits </link:label>
<link:label id="lab_us-gaap_EmployeeSeveranceMember_D45A3FB5527FBA9A71E707CE9C56D674_label_en-US" xlink:label="lab_us-gaap_EmployeeSeveranceMember_D45A3FB5527FBA9A71E707CE9C56D674" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Employee Severance [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeSeveranceMember" xlink:label="loc_us-gaap_EmployeeSeveranceMember_D45A3FB5527FBA9A71E707CE9C56D674" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherRestructuringMember_6363DF9D52FC93FE803A07CE9C5B3F1C_terseLabel_en-US" xlink:label="lab_us-gaap_OtherRestructuringMember_6363DF9D52FC93FE803A07CE9C5B3F1C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other </link:label>
<link:label id="lab_us-gaap_OtherRestructuringMember_6363DF9D52FC93FE803A07CE9C5B3F1C_label_en-US" xlink:label="lab_us-gaap_OtherRestructuringMember_6363DF9D52FC93FE803A07CE9C5B3F1C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Restructuring [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherRestructuringMember" xlink:label="loc_us-gaap_OtherRestructuringMember_6363DF9D52FC93FE803A07CE9C5B3F1C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NetCashProvidedByUsedInContinuingOperations_60D0E98AD20B9E5A69A807CE9C5BAEEA_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInContinuingOperations_60D0E98AD20B9E5A69A807CE9C5BAEEA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net cash (used in) provided by continuing operations </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInContinuingOperations_60D0E98AD20B9E5A69A807CE9C5BAEEA_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInContinuingOperations_60D0E98AD20B9E5A69A807CE9C5BAEEA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Continuing Operations </link:label>
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<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_D5300226CAA6DEFE831307CE9C5B4210_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_D5300226CAA6DEFE831307CE9C5B4210" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash </link:label>
<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_D5300226CAA6DEFE831307CE9C5B4210_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_D5300226CAA6DEFE831307CE9C5B4210" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash and Cash Equivalents, at Carrying Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_D5300226CAA6DEFE831307CE9C5B4210" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_D5300226CAA6DEFE831307CE9C5B4210" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_D5300226CAA6DEFE831307CE9C5B4210" xlink:type="arc"/>
<link:label id="lab_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated_E1A08884ED481EC6685E07CE9C5BCCEE_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated_E1A08884ED481EC6685E07CE9C5BCCEE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of positions eliminated </link:label>
<link:label id="lab_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated_E1A08884ED481EC6685E07CE9C5BCCEE_label_en-US" xlink:label="lab_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated_E1A08884ED481EC6685E07CE9C5BCCEE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructuring and Related Cost, Number of Positions Eliminated </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated" xlink:label="loc_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated_E1A08884ED481EC6685E07CE9C5BCCEE" xlink:type="locator"/>
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<link:label id="lab_efoi_ImpactOfRestructuringActivitiesOnOperatingExpenses_AE9EB94C16F4703570B507CE9C5B53B3_terseLabel_en-US" xlink:label="lab_efoi_ImpactOfRestructuringActivitiesOnOperatingExpenses_AE9EB94C16F4703570B507CE9C5B53B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Decrease in operating expense </link:label>
<link:label id="lab_efoi_ImpactOfRestructuringActivitiesOnOperatingExpenses_AE9EB94C16F4703570B507CE9C5B53B3_label_en-US" xlink:label="lab_efoi_ImpactOfRestructuringActivitiesOnOperatingExpenses_AE9EB94C16F4703570B507CE9C5B53B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Impact Of Restructuring Activities On Operating Expenses </link:label>
<link:label id="lab_efoi_ImpactOfRestructuringActivitiesOnOperatingExpenses_AE9EB94C16F4703570B507CE9C5B53B3_documentation_en-US" xlink:label="lab_efoi_ImpactOfRestructuringActivitiesOnOperatingExpenses_AE9EB94C16F4703570B507CE9C5B53B3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Impact Of Restructuring Activities On Operating Expenses </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_ImpactOfRestructuringActivitiesOnOperatingExpenses" xlink:label="loc_efoi_ImpactOfRestructuringActivitiesOnOperatingExpenses_AE9EB94C16F4703570B507CE9C5B53B3" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RestructuringCostsAndAssetImpairmentCharges_4634015C2D51E458400B07CE9C5B2641_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringCostsAndAssetImpairmentCharges_4634015C2D51E458400B07CE9C5B2641" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restructuring costs and asset impairment charges </link:label>
<link:label id="lab_us-gaap_RestructuringCostsAndAssetImpairmentCharges_4634015C2D51E458400B07CE9C5B2641_label_en-US" xlink:label="lab_us-gaap_RestructuringCostsAndAssetImpairmentCharges_4634015C2D51E458400B07CE9C5B2641" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructuring Costs and Asset Impairment Charges </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringCostsAndAssetImpairmentCharges" xlink:label="loc_us-gaap_RestructuringCostsAndAssetImpairmentCharges_4634015C2D51E458400B07CE9C5B2641" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RestructuringCharges_3012B29144E2FD15A98207CE9C5B02CD_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringCharges_3012B29144E2FD15A98207CE9C5B02CD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restructuring charges </link:label>
<link:label id="lab_us-gaap_RestructuringCharges_3012B29144E2FD15A98207CE9C5B02CD_label_en-US" xlink:label="lab_us-gaap_RestructuringCharges_3012B29144E2FD15A98207CE9C5B02CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructuring Charges </link:label>
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<link:label id="lab_efoi_RevenuePercentChange_D3474EF5A097D7FE566007CE9C5BEC42_terseLabel_en-US" xlink:label="lab_efoi_RevenuePercentChange_D3474EF5A097D7FE566007CE9C5BEC42" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Change in revenue, percent </link:label>
<link:label id="lab_efoi_RevenuePercentChange_D3474EF5A097D7FE566007CE9C5BEC42_label_en-US" xlink:label="lab_efoi_RevenuePercentChange_D3474EF5A097D7FE566007CE9C5BEC42" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue, Percent Change </link:label>
<link:label id="lab_efoi_RevenuePercentChange_D3474EF5A097D7FE566007CE9C5BEC42_documentation_en-US" xlink:label="lab_efoi_RevenuePercentChange_D3474EF5A097D7FE566007CE9C5BEC42" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Revenue, Percent Change </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RevenuePercentChange" xlink:label="loc_efoi_RevenuePercentChange_D3474EF5A097D7FE566007CE9C5BEC42" xlink:type="locator"/>
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<link:label id="lab_efoi_RestructuringBidPriceMinimumRequiredForContinuedListing_81C2DCC66451B61FE33E07CE9C5B5470_terseLabel_en-US" xlink:label="lab_efoi_RestructuringBidPriceMinimumRequiredForContinuedListing_81C2DCC66451B61FE33E07CE9C5B5470" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Bid price (in dollars per share) </link:label>
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<link:label id="lab_efoi_RestructuringBidPriceMinimumRequiredForContinuedListing_81C2DCC66451B61FE33E07CE9C5B5470_documentation_en-US" xlink:label="lab_efoi_RestructuringBidPriceMinimumRequiredForContinuedListing_81C2DCC66451B61FE33E07CE9C5B5470" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Restructuring, Bid Price Minimum Required For Continued Listing </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuringBidPriceMinimumRequiredForContinuedListing" xlink:label="loc_efoi_RestructuringBidPriceMinimumRequiredForContinuedListing_81C2DCC66451B61FE33E07CE9C5B5470" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_088B24375EE2E5C4887AC5B5437C7902_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_088B24375EE2E5C4887AC5B5437C7902" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of Options </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_088B24375EE2E5C4887AC5B5437C7902_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_088B24375EE2E5C4887AC5B5437C7902" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_088B24375EE2E5C4887AC5B5437C7902" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_197791974572AD5480ECC5B5437C91E4_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_197791974572AD5480ECC5B5437C91E4" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Outstanding at beginning of period (in shares) </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_DE8812DC171CBF089724C5B5437C76F3_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_DE8812DC171CBF089724C5B5437C76F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Granted (in shares) </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_C0A7770A5DA0613D6B0AC5B5437EEF6E_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_C0A7770A5DA0613D6B0AC5B5437EEF6E" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Expired (in shares) </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_C0A7770A5DA0613D6B0AC5B5437EEF6E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_E3749F5F5C6952469820C5B5437C1640_negatedLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_E3749F5F5C6952469820C5B5437C1640" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Exercised (in shares) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_E3749F5F5C6952469820C5B5437C1640" xlink:type="locator"/>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_49F70F072DF24ED1FF74C5B5437DAE10" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_5439474985E3CD4618E0C5B5437D3E30_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_5439474985E3CD4618E0C5B5437D3E30" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vested and expected to vest (in shares) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_5439474985E3CD4618E0C5B5437D3E30_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_5439474985E3CD4618E0C5B5437D3E30" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_797E2A3392A0CD70B1D6C5B5437D63B8_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_797E2A3392A0CD70B1D6C5B5437D63B8" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Exercisable (in shares) </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_797E2A3392A0CD70B1D6C5B5437D63B8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_E6FBC2EC1FF52D8EC087C5B5437D406C_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_E6FBC2EC1FF52D8EC087C5B5437D406C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted Average Exercise Price Per Share </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_E6FBC2EC1FF52D8EC087C5B5437D406C_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_E6FBC2EC1FF52D8EC087C5B5437D406C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_BBCBCFA81FB804B23098C5B5437D2CBF_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_BBCBCFA81FB804B23098C5B5437D2CBF" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Outstanding at beginning of period (in dollars per share) </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_1C04D8C01A05A97B9DE2C5B5437ED93C_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_1C04D8C01A05A97B9DE2C5B5437ED93C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Granted (in dollars per share) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_1C04D8C01A05A97B9DE2C5B5437ED93C_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_1C04D8C01A05A97B9DE2C5B5437ED93C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_9E75EB268A0FE4EE7305C5B5437E8361_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_9E75EB268A0FE4EE7305C5B5437E8361" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Canceled (in dollars per share) </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_9E75EB268A0FE4EE7305C5B5437E8361" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_9E820B63FD3A2C1A10ABC5B5437E0F04_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_9E820B63FD3A2C1A10ABC5B5437E0F04" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_9E820B63FD3A2C1A10ABC5B5437E0F04" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_9E820B63FD3A2C1A10ABC5B5437E0F04" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_9E820B63FD3A2C1A10ABC5B5437E0F04" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_C788977E9C54F5E50E86C5B5437E6F55_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_C788977E9C54F5E50E86C5B5437E6F55" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Exercised (in dollars per share) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_C788977E9C54F5E50E86C5B5437E6F55_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_C788977E9C54F5E50E86C5B5437E6F55" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_C788977E9C54F5E50E86C5B5437E6F55" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_C788977E9C54F5E50E86C5B5437E6F55" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_C788977E9C54F5E50E86C5B5437E6F55" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_9A29E2D6A5D939F753B6C5B5437E7C57_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_9A29E2D6A5D939F753B6C5B5437E7C57" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Outstanding at end of period (in dollars per share) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_9A29E2D6A5D939F753B6C5B5437E7C57" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_9A29E2D6A5D939F753B6C5B5437E7C57" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_9A29E2D6A5D939F753B6C5B5437E7C57" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_40D8ACB39FEE554E8BF6C5B5437F5436_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_40D8ACB39FEE554E8BF6C5B5437F5436" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vested and expected to vest (in dollars per share) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_40D8ACB39FEE554E8BF6C5B5437F5436_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_40D8ACB39FEE554E8BF6C5B5437F5436" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_40D8ACB39FEE554E8BF6C5B5437F5436" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_40D8ACB39FEE554E8BF6C5B5437F5436" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_40D8ACB39FEE554E8BF6C5B5437F5436" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_3F27FE2F1BDF31E5000FC5B5437F5307_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_3F27FE2F1BDF31E5000FC5B5437F5307" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Exercisable (in dollars per share) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_3F27FE2F1BDF31E5000FC5B5437F5307_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_3F27FE2F1BDF31E5000FC5B5437F5307" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_3F27FE2F1BDF31E5000FC5B5437F5307" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_3F27FE2F1BDF31E5000FC5B5437F5307" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_3F27FE2F1BDF31E5000FC5B5437F5307" xlink:type="arc"/>
<link:label id="lab_us-gaap_UseOfEstimates_F0A174A9893BABE06D29E460CDD03558_terseLabel_en-US" xlink:label="lab_us-gaap_UseOfEstimates_F0A174A9893BABE06D29E460CDD03558" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Use of estimates </link:label>
<link:label id="lab_us-gaap_UseOfEstimates_F0A174A9893BABE06D29E460CDD03558_label_en-US" xlink:label="lab_us-gaap_UseOfEstimates_F0A174A9893BABE06D29E460CDD03558" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Use of Estimates, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UseOfEstimates" xlink:label="loc_us-gaap_UseOfEstimates_F0A174A9893BABE06D29E460CDD03558" xlink:type="locator"/>
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<link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_17D3245AE5EEC156DA00E460CDD0A6AB_terseLabel_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_17D3245AE5EEC156DA00E460CDD0A6AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Basis of presentation </link:label>
<link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_17D3245AE5EEC156DA00E460CDD0A6AB_label_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_17D3245AE5EEC156DA00E460CDD0A6AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Basis of Accounting, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:label="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_17D3245AE5EEC156DA00E460CDD0A6AB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_17D3245AE5EEC156DA00E460CDD0A6AB" xlink:to="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_17D3245AE5EEC156DA00E460CDD0A6AB" xlink:type="arc"/>
<link:label id="lab_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_A3148832C4FAF6B4D697E460CDD04D57_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_A3148832C4FAF6B4D697E460CDD04D57" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue recognition </link:label>
<link:label id="lab_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_A3148832C4FAF6B4D697E460CDD04D57_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_A3148832C4FAF6B4D697E460CDD04D57" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue from Contract with Customer [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerPolicyTextBlock" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_A3148832C4FAF6B4D697E460CDD04D57" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_A3148832C4FAF6B4D697E460CDD04D57" xlink:to="lab_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_A3148832C4FAF6B4D697E460CDD04D57" xlink:type="arc"/>
<link:label id="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_2E536C3B5586767B32F9E460CDD0B9AA_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_2E536C3B5586767B32F9E460CDD0B9AA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash and cash equivalents </link:label>
<link:label id="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_2E536C3B5586767B32F9E460CDD0B9AA_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_2E536C3B5586767B32F9E460CDD0B9AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash and Cash Equivalents, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:label="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock_2E536C3B5586767B32F9E460CDD0B9AA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock_2E536C3B5586767B32F9E460CDD0B9AA" xlink:to="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_2E536C3B5586767B32F9E460CDD0B9AA" xlink:type="arc"/>
<link:label id="lab_us-gaap_InventoryPolicyTextBlock_046D03E1483A2877DE27E460CDD19958_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryPolicyTextBlock_046D03E1483A2877DE27E460CDD19958" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Inventories </link:label>
<link:label id="lab_us-gaap_InventoryPolicyTextBlock_046D03E1483A2877DE27E460CDD19958_label_en-US" xlink:label="lab_us-gaap_InventoryPolicyTextBlock_046D03E1483A2877DE27E460CDD19958" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryPolicyTextBlock" xlink:label="loc_us-gaap_InventoryPolicyTextBlock_046D03E1483A2877DE27E460CDD19958" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryPolicyTextBlock_046D03E1483A2877DE27E460CDD19958" xlink:to="lab_us-gaap_InventoryPolicyTextBlock_046D03E1483A2877DE27E460CDD19958" xlink:type="arc"/>
<link:label id="lab_us-gaap_TradeAndOtherAccountsReceivablePolicy_81E5D01F9B02432D49ABE460CDD116A5_terseLabel_en-US" xlink:label="lab_us-gaap_TradeAndOtherAccountsReceivablePolicy_81E5D01F9B02432D49ABE460CDD116A5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts receivables </link:label>
<link:label id="lab_us-gaap_TradeAndOtherAccountsReceivablePolicy_81E5D01F9B02432D49ABE460CDD116A5_label_en-US" xlink:label="lab_us-gaap_TradeAndOtherAccountsReceivablePolicy_81E5D01F9B02432D49ABE460CDD116A5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Receivable [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TradeAndOtherAccountsReceivablePolicy" xlink:label="loc_us-gaap_TradeAndOtherAccountsReceivablePolicy_81E5D01F9B02432D49ABE460CDD116A5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TradeAndOtherAccountsReceivablePolicy_81E5D01F9B02432D49ABE460CDD116A5" xlink:to="lab_us-gaap_TradeAndOtherAccountsReceivablePolicy_81E5D01F9B02432D49ABE460CDD116A5" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_12B4957471B0B7478D32E460CDD14165_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock_12B4957471B0B7478D32E460CDD14165" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income taxes </link:label>
<link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_12B4957471B0B7478D32E460CDD14165_label_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock_12B4957471B0B7478D32E460CDD14165" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Tax, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxPolicyTextBlock" xlink:label="loc_us-gaap_IncomeTaxPolicyTextBlock_12B4957471B0B7478D32E460CDD14165" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxPolicyTextBlock_12B4957471B0B7478D32E460CDD14165" xlink:to="lab_us-gaap_IncomeTaxPolicyTextBlock_12B4957471B0B7478D32E460CDD14165" xlink:type="arc"/>
<link:label id="lab_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_487D73DC3C791D11AF68E460CDD1917B_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_487D73DC3C791D11AF68E460CDD1917B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair value measurements </link:label>
<link:label id="lab_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_487D73DC3C791D11AF68E460CDD1917B_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_487D73DC3C791D11AF68E460CDD1917B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Measurement, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementPolicyPolicyTextBlock" xlink:label="loc_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_487D73DC3C791D11AF68E460CDD1917B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_487D73DC3C791D11AF68E460CDD1917B" xlink:to="lab_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_487D73DC3C791D11AF68E460CDD1917B" xlink:type="arc"/>
<link:label id="lab_efoi_LongLivedAssetsPolicyPolicyTextBlock_E0331F6786BEF0665804E460CDD1ACCD_terseLabel_en-US" xlink:label="lab_efoi_LongLivedAssetsPolicyPolicyTextBlock_E0331F6786BEF0665804E460CDD1ACCD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-lived assets </link:label>
<link:label id="lab_efoi_LongLivedAssetsPolicyPolicyTextBlock_E0331F6786BEF0665804E460CDD1ACCD_label_en-US" xlink:label="lab_efoi_LongLivedAssetsPolicyPolicyTextBlock_E0331F6786BEF0665804E460CDD1ACCD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long Lived Assets Policy [Policy Text Block] </link:label>
<link:label id="lab_efoi_LongLivedAssetsPolicyPolicyTextBlock_E0331F6786BEF0665804E460CDD1ACCD_documentation_en-US" xlink:label="lab_efoi_LongLivedAssetsPolicyPolicyTextBlock_E0331F6786BEF0665804E460CDD1ACCD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Disclosure of accounting policy for property, plant and equipment as well as goodwill and intangible assets, which may include the basis of such assets, depreciation methods used and estimated useful lives, the entity's capitalization policy, including its accounting treatment for costs incurred for repairs and maintenance activities, whether such asset balances include capitalized interest and the method by which such is calculated, how disposals of such assets are accounted for and how impairment of such assets is assessed and recognized. </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_LongLivedAssetsPolicyPolicyTextBlock" xlink:label="loc_efoi_LongLivedAssetsPolicyPolicyTextBlock_E0331F6786BEF0665804E460CDD1ACCD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_LongLivedAssetsPolicyPolicyTextBlock_E0331F6786BEF0665804E460CDD1ACCD" xlink:to="lab_efoi_LongLivedAssetsPolicyPolicyTextBlock_E0331F6786BEF0665804E460CDD1ACCD" xlink:type="arc"/>
<link:label id="lab_us-gaap_ConcentrationRiskCreditRisk_80A3D996FAB3CCF580ACE460CDD197E4_terseLabel_en-US" xlink:label="lab_us-gaap_ConcentrationRiskCreditRisk_80A3D996FAB3CCF580ACE460CDD197E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Certain risks and concentrations </link:label>
<link:label id="lab_us-gaap_ConcentrationRiskCreditRisk_80A3D996FAB3CCF580ACE460CDD197E4_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskCreditRisk_80A3D996FAB3CCF580ACE460CDD197E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Concentration Risk, Credit Risk, Policy [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_ResearchAndDevelopmentExpensePolicy_D441C6271D4AF74C653FE460CDD1DDAA_terseLabel_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpensePolicy_D441C6271D4AF74C653FE460CDD1DDAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Product development </link:label>
<link:label id="lab_us-gaap_ResearchAndDevelopmentExpensePolicy_D441C6271D4AF74C653FE460CDD1DDAA_label_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpensePolicy_D441C6271D4AF74C653FE460CDD1DDAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Research and Development Expense, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ResearchAndDevelopmentExpensePolicy" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpensePolicy_D441C6271D4AF74C653FE460CDD1DDAA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_EarningsPerSharePolicyTextBlock_2BC189EE3506A2C261EEE460CDD22FC1_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerSharePolicyTextBlock_2BC189EE3506A2C261EEE460CDD22FC1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net income (loss) per share </link:label>
<link:label id="lab_us-gaap_EarningsPerSharePolicyTextBlock_2BC189EE3506A2C261EEE460CDD22FC1_label_en-US" xlink:label="lab_us-gaap_EarningsPerSharePolicyTextBlock_2BC189EE3506A2C261EEE460CDD22FC1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Earnings Per Share, Policy [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_338973CA83F24B3DB60DE460CDD2C2A5_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_338973CA83F24B3DB60DE460CDD2C2A5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock-based compensation </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_338973CA83F24B3DB60DE460CDD2C2A5_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy_338973CA83F24B3DB60DE460CDD2C2A5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement [Policy Text Block] </link:label>
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<link:label id="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_B014EED2FD1ED67D1D37E460CDD265A8_terseLabel_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_B014EED2FD1ED67D1D37E460CDD265A8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Foreign currency translation </link:label>
<link:label id="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_B014EED2FD1ED67D1D37E460CDD265A8_label_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_B014EED2FD1ED67D1D37E460CDD265A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Foreign Currency Transactions and Translations Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock" xlink:label="loc_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_B014EED2FD1ED67D1D37E460CDD265A8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_B014EED2FD1ED67D1D37E460CDD265A8" xlink:to="lab_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_B014EED2FD1ED67D1D37E460CDD265A8" xlink:type="arc"/>
<link:label id="lab_us-gaap_AdvertisingCostsPolicyTextBlock_AEAC61202D076E5F8BC8E460CDD25D31_terseLabel_en-US" xlink:label="lab_us-gaap_AdvertisingCostsPolicyTextBlock_AEAC61202D076E5F8BC8E460CDD25D31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Advertising expenses </link:label>
<link:label id="lab_us-gaap_AdvertisingCostsPolicyTextBlock_AEAC61202D076E5F8BC8E460CDD25D31_label_en-US" xlink:label="lab_us-gaap_AdvertisingCostsPolicyTextBlock_AEAC61202D076E5F8BC8E460CDD25D31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Advertising Cost [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdvertisingCostsPolicyTextBlock" xlink:label="loc_us-gaap_AdvertisingCostsPolicyTextBlock_AEAC61202D076E5F8BC8E460CDD25D31" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StandardProductWarrantyPolicy_6E1EFAFF1B7CDCE0CB96E460CDD2F388_terseLabel_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyPolicy_6E1EFAFF1B7CDCE0CB96E460CDD2F388" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Product warranties </link:label>
<link:label id="lab_us-gaap_StandardProductWarrantyPolicy_6E1EFAFF1B7CDCE0CB96E460CDD2F388_label_en-US" xlink:label="lab_us-gaap_StandardProductWarrantyPolicy_6E1EFAFF1B7CDCE0CB96E460CDD2F388" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Standard Product Warranty, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StandardProductWarrantyPolicy" xlink:label="loc_us-gaap_StandardProductWarrantyPolicy_6E1EFAFF1B7CDCE0CB96E460CDD2F388" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StandardProductWarrantyPolicy_6E1EFAFF1B7CDCE0CB96E460CDD2F388" xlink:to="lab_us-gaap_StandardProductWarrantyPolicy_6E1EFAFF1B7CDCE0CB96E460CDD2F388" xlink:type="arc"/>
<link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8CDBABAA13167AA0766FE460CDD25BC1_terseLabel_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8CDBABAA13167AA0766FE460CDD25BC1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Recent accounting standards and pronouncements </link:label>
<link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8CDBABAA13167AA0766FE460CDD25BC1_label_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8CDBABAA13167AA0766FE460CDD25BC1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> New Accounting Pronouncements, Policy [Policy Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:label="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8CDBABAA13167AA0766FE460CDD25BC1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8CDBABAA13167AA0766FE460CDD25BC1" xlink:to="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8CDBABAA13167AA0766FE460CDD25BC1" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_26778712C075F357D674E460CD4036DF_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_26778712C075F357D674E460CD4036DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Accrued Current Liabilities </link:label>
<link:label id="lab_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_26778712C075F357D674E460CD4036DF_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_26778712C075F357D674E460CD4036DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Accrued Liabilities [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_26778712C075F357D674E460CD4036DF" xlink:type="locator"/>
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<link:label id="lab_us-gaap_InventoryDisclosureTextBlock_34AFCD332581A9C3BC8FC546306FF9E1_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryDisclosureTextBlock_34AFCD332581A9C3BC8FC546306FF9E1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Inventories </link:label>
<link:label id="lab_us-gaap_InventoryDisclosureTextBlock_34AFCD332581A9C3BC8FC546306FF9E1_label_en-US" xlink:label="lab_us-gaap_InventoryDisclosureTextBlock_34AFCD332581A9C3BC8FC546306FF9E1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory Disclosure [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryDisclosureTextBlock" xlink:label="loc_us-gaap_InventoryDisclosureTextBlock_34AFCD332581A9C3BC8FC546306FF9E1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtDisclosureTextBlock_8CF70297E5E13510D57CC546301B09D3_terseLabel_en-US" xlink:label="lab_us-gaap_DebtDisclosureTextBlock_8CF70297E5E13510D57CC546301B09D3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt </link:label>
<link:label id="lab_us-gaap_DebtDisclosureTextBlock_8CF70297E5E13510D57CC546301B09D3_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureTextBlock_8CF70297E5E13510D57CC546301B09D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Disclosure [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtDisclosureTextBlock" xlink:label="loc_us-gaap_DebtDisclosureTextBlock_8CF70297E5E13510D57CC546301B09D3" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SubsequentEventTable_B977800257D279107AF2C67B7A2466C6_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventTable_B977800257D279107AF2C67B7A2466C6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Subsequent Event [Table] </link:label>
<link:label id="lab_us-gaap_SubsequentEventTable_B977800257D279107AF2C67B7A2466C6_label_en-US" xlink:label="lab_us-gaap_SubsequentEventTable_B977800257D279107AF2C67B7A2466C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Subsequent Event [Table] </link:label>
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<link:label id="lab_us-gaap_SubsequentEventLineItems_C08511119E2630586379C67B7A271DAB_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventLineItems_C08511119E2630586379C67B7A271DAB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Subsequent Event [Line Items] </link:label>
<link:label id="lab_us-gaap_SubsequentEventLineItems_C08511119E2630586379C67B7A271DAB_label_en-US" xlink:label="lab_us-gaap_SubsequentEventLineItems_C08511119E2630586379C67B7A271DAB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Subsequent Event [Line Items] </link:label>
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<link:label id="lab_efoi_PaymentsForPlacementAgentCommissions_C2DE347436899C5EFC4DC6871362A491_terseLabel_en-US" xlink:label="lab_efoi_PaymentsForPlacementAgentCommissions_C2DE347436899C5EFC4DC6871362A491" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amount paid for placement agent commissions </link:label>
<link:label id="lab_efoi_PaymentsForPlacementAgentCommissions_C2DE347436899C5EFC4DC6871362A491_label_en-US" xlink:label="lab_efoi_PaymentsForPlacementAgentCommissions_C2DE347436899C5EFC4DC6871362A491" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments For Placement Agent Commissions </link:label>
<link:label id="lab_efoi_PaymentsForPlacementAgentCommissions_C2DE347436899C5EFC4DC6871362A491_documentation_en-US" xlink:label="lab_efoi_PaymentsForPlacementAgentCommissions_C2DE347436899C5EFC4DC6871362A491" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Payments For Placement Agent Commissions </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_PaymentsForPlacementAgentCommissions" xlink:label="loc_efoi_PaymentsForPlacementAgentCommissions_C2DE347436899C5EFC4DC6871362A491" xlink:type="locator"/>
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<link:label id="lab_efoi_PaymentsRelatedToExpensesForRegisteredDirectOfferingAndConcurrentPrivatePlacement_E35221A2F0DDE32390B7C687707D53CC_terseLabel_en-US" xlink:label="lab_efoi_PaymentsRelatedToExpensesForRegisteredDirectOfferingAndConcurrentPrivatePlacement_E35221A2F0DDE32390B7C687707D53CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amount paid related to expenses for registered direct offering and concurrent private placement </link:label>
<link:label id="lab_efoi_PaymentsRelatedToExpensesForRegisteredDirectOfferingAndConcurrentPrivatePlacement_E35221A2F0DDE32390B7C687707D53CC_label_en-US" xlink:label="lab_efoi_PaymentsRelatedToExpensesForRegisteredDirectOfferingAndConcurrentPrivatePlacement_E35221A2F0DDE32390B7C687707D53CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments Related To Expenses For Registered Direct Offering And Concurrent Private Placement </link:label>
<link:label id="lab_efoi_PaymentsRelatedToExpensesForRegisteredDirectOfferingAndConcurrentPrivatePlacement_E35221A2F0DDE32390B7C687707D53CC_documentation_en-US" xlink:label="lab_efoi_PaymentsRelatedToExpensesForRegisteredDirectOfferingAndConcurrentPrivatePlacement_E35221A2F0DDE32390B7C687707D53CC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Payments Related To Expenses For Registered Direct Offering And Concurrent Private Placement </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_PaymentsRelatedToExpensesForRegisteredDirectOfferingAndConcurrentPrivatePlacement" xlink:label="loc_efoi_PaymentsRelatedToExpensesForRegisteredDirectOfferingAndConcurrentPrivatePlacement_E35221A2F0DDE32390B7C687707D53CC" xlink:type="locator"/>
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<link:label id="lab_efoi_PaymentsForClearingFees_F73452D4F4A0CD3C591BC687B3EEB36B_terseLabel_en-US" xlink:label="lab_efoi_PaymentsForClearingFees_F73452D4F4A0CD3C591BC687B3EEB36B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amount paid for clearing fees </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit_E01986B80125045318DE07F8EC38796C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LesseeOperatingLeasesTextBlock_7343AC4E1409523D6F9EC54630CA6765_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeasesTextBlock_7343AC4E1409523D6F9EC54630CA6765" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Leases [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeasesTextBlock" xlink:label="loc_us-gaap_LesseeOperatingLeasesTextBlock_7343AC4E1409523D6F9EC54630CA6765" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeasesTextBlock_7343AC4E1409523D6F9EC54630CA6765" xlink:to="lab_us-gaap_LesseeOperatingLeasesTextBlock_7343AC4E1409523D6F9EC54630CA6765" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock_46AE8FAEAC1AAFCE3D90C5462E54F068_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock_46AE8FAEAC1AAFCE3D90C5462E54F068" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Quarterly Financial Data </link:label>
<link:label id="lab_us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock_46AE8FAEAC1AAFCE3D90C5462E54F068_label_en-US" xlink:label="lab_us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock_46AE8FAEAC1AAFCE3D90C5462E54F068" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Quarterly Financial Information [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock_46AE8FAEAC1AAFCE3D90C5462E54F068" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_C85183B4F65EA0368B84DE0D626AA612_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_C85183B4F65EA0368B84DE0D626AA612" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restructuring </link:label>
<link:label id="lab_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_C85183B4F65EA0368B84DE0D626AA612_label_en-US" xlink:label="lab_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_C85183B4F65EA0368B84DE0D626AA612" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructuring and Related Activities Disclosure [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock" xlink:label="loc_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_C85183B4F65EA0368B84DE0D626AA612" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_C85183B4F65EA0368B84DE0D626AA612" xlink:to="lab_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_C85183B4F65EA0368B84DE0D626AA612" xlink:type="arc"/>
<link:label id="lab_efoi_FlickerFreeTLEDsMember_3AC95817E5305AF850B8E460CDDBF872_terseLabel_en-US" xlink:label="lab_efoi_FlickerFreeTLEDsMember_3AC95817E5305AF850B8E460CDDBF872" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Flicker-Free TLEDs </link:label>
<link:label id="lab_efoi_FlickerFreeTLEDsMember_3AC95817E5305AF850B8E460CDDBF872_label_en-US" xlink:label="lab_efoi_FlickerFreeTLEDsMember_3AC95817E5305AF850B8E460CDDBF872" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Flicker-Free TLEDs [Member] </link:label>
<link:label id="lab_efoi_FlickerFreeTLEDsMember_3AC95817E5305AF850B8E460CDDBF872_documentation_en-US" xlink:label="lab_efoi_FlickerFreeTLEDsMember_3AC95817E5305AF850B8E460CDDBF872" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Flicker-Free TLEDs [Member] </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_FlickerFreeTLEDsMember" xlink:label="loc_efoi_FlickerFreeTLEDsMember_3AC95817E5305AF850B8E460CDDBF872" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_FlickerFreeTLEDsMember_3AC95817E5305AF850B8E460CDDBF872" xlink:to="lab_efoi_FlickerFreeTLEDsMember_3AC95817E5305AF850B8E460CDDBF872" xlink:type="arc"/>
<link:label id="lab_efoi_LegacyLuminaireProductLineMember_41C0ED606E69E2409A6CE460CDDC1C4F_terseLabel_en-US" xlink:label="lab_efoi_LegacyLuminaireProductLineMember_41C0ED606E69E2409A6CE460CDDC1C4F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Legacy Luminaire Product Line </link:label>
<link:label id="lab_efoi_LegacyLuminaireProductLineMember_41C0ED606E69E2409A6CE460CDDC1C4F_label_en-US" xlink:label="lab_efoi_LegacyLuminaireProductLineMember_41C0ED606E69E2409A6CE460CDDC1C4F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Legacy Luminaire Product Line [Member] </link:label>
<link:label id="lab_efoi_LegacyLuminaireProductLineMember_41C0ED606E69E2409A6CE460CDDC1C4F_documentation_en-US" xlink:label="lab_efoi_LegacyLuminaireProductLineMember_41C0ED606E69E2409A6CE460CDDC1C4F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Legacy Luminaire Product Line [Member] </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_LegacyLuminaireProductLineMember" xlink:label="loc_efoi_LegacyLuminaireProductLineMember_41C0ED606E69E2409A6CE460CDDC1C4F" xlink:type="locator"/>
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<link:label id="lab_efoi_StandardProductWarrantyNumberofYears_4A3964D7BA713D4D4903E460CDDC2896_terseLabel_en-US" xlink:label="lab_efoi_StandardProductWarrantyNumberofYears_4A3964D7BA713D4D4903E460CDDC2896" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Standard Product Warranty, Number of Years </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_StandardProductWarrantyNumberofYears" xlink:label="loc_efoi_StandardProductWarrantyNumberofYears_4A3964D7BA713D4D4903E460CDDC2896" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_StandardProductWarrantyNumberofYears_4A3964D7BA713D4D4903E460CDDC2896" xlink:to="lab_efoi_StandardProductWarrantyNumberofYears_4A3964D7BA713D4D4903E460CDDC2896" xlink:type="arc"/>
<link:label id="lab_efoi_SalesCoverageNumberOfGeographicRegions_58F77E579BC2C41DCC41E460CDDCDC20_terseLabel_en-US" xlink:label="lab_efoi_SalesCoverageNumberOfGeographicRegions_58F77E579BC2C41DCC41E460CDDCDC20" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of geographic regions </link:label>
<link:label id="lab_efoi_SalesCoverageNumberOfGeographicRegions_58F77E579BC2C41DCC41E460CDDCDC20_label_en-US" xlink:label="lab_efoi_SalesCoverageNumberOfGeographicRegions_58F77E579BC2C41DCC41E460CDDCDC20" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Sales Coverage, Number Of Geographic Regions </link:label>
<link:label id="lab_efoi_SalesCoverageNumberOfGeographicRegions_58F77E579BC2C41DCC41E460CDDCDC20_documentation_en-US" xlink:label="lab_efoi_SalesCoverageNumberOfGeographicRegions_58F77E579BC2C41DCC41E460CDDCDC20" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Sales Coverage, Number Of Geographic Regions </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_SalesCoverageNumberOfGeographicRegions" xlink:label="loc_efoi_SalesCoverageNumberOfGeographicRegions_58F77E579BC2C41DCC41E460CDDCDC20" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_SalesCoverageNumberOfGeographicRegions_58F77E579BC2C41DCC41E460CDDCDC20" xlink:to="lab_efoi_SalesCoverageNumberOfGeographicRegions_58F77E579BC2C41DCC41E460CDDCDC20" xlink:type="arc"/>
<link:label id="lab_efoi_SalesCoverageNumberOfSalesAgencies_CF1E12E0D8ABAB520807E460CDDD227C_terseLabel_en-US" xlink:label="lab_efoi_SalesCoverageNumberOfSalesAgencies_CF1E12E0D8ABAB520807E460CDDD227C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of sales agencies </link:label>
<link:label id="lab_efoi_SalesCoverageNumberOfSalesAgencies_CF1E12E0D8ABAB520807E460CDDD227C_label_en-US" xlink:label="lab_efoi_SalesCoverageNumberOfSalesAgencies_CF1E12E0D8ABAB520807E460CDDD227C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Sales Coverage, Number Of Sales Agencies </link:label>
<link:label id="lab_efoi_SalesCoverageNumberOfSalesAgencies_CF1E12E0D8ABAB520807E460CDDD227C_documentation_en-US" xlink:label="lab_efoi_SalesCoverageNumberOfSalesAgencies_CF1E12E0D8ABAB520807E460CDDD227C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Sales Coverage, Number Of Sales Agencies </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_SalesCoverageNumberOfSalesAgencies" xlink:label="loc_efoi_SalesCoverageNumberOfSalesAgencies_CF1E12E0D8ABAB520807E460CDDD227C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_SalesCoverageNumberOfSalesAgencies_CF1E12E0D8ABAB520807E460CDDD227C" xlink:to="lab_efoi_SalesCoverageNumberOfSalesAgencies_CF1E12E0D8ABAB520807E460CDDD227C" xlink:type="arc"/>
<link:label id="lab_efoi_SalesCoverageNumberOfSalesAgents_AE5E46D7E396B7DF8F47E460CDDD5B3D_terseLabel_en-US" xlink:label="lab_efoi_SalesCoverageNumberOfSalesAgents_AE5E46D7E396B7DF8F47E460CDDD5B3D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of sales agents </link:label>
<link:label id="lab_efoi_SalesCoverageNumberOfSalesAgents_AE5E46D7E396B7DF8F47E460CDDD5B3D_label_en-US" xlink:label="lab_efoi_SalesCoverageNumberOfSalesAgents_AE5E46D7E396B7DF8F47E460CDDD5B3D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Sales Coverage, Number Of Sales Agents </link:label>
<link:label id="lab_efoi_SalesCoverageNumberOfSalesAgents_AE5E46D7E396B7DF8F47E460CDDD5B3D_documentation_en-US" xlink:label="lab_efoi_SalesCoverageNumberOfSalesAgents_AE5E46D7E396B7DF8F47E460CDDD5B3D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Sales Coverage, Number Of Sales Agents </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_SalesCoverageNumberOfSalesAgents" xlink:label="loc_efoi_SalesCoverageNumberOfSalesAgents_AE5E46D7E396B7DF8F47E460CDDD5B3D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_SalesCoverageNumberOfSalesAgents_AE5E46D7E396B7DF8F47E460CDDD5B3D" xlink:to="lab_efoi_SalesCoverageNumberOfSalesAgents_AE5E46D7E396B7DF8F47E460CDDD5B3D" xlink:type="arc"/>
<link:label id="lab_efoi_RestructuringAndRelatedCostNumberOfNewProductFamilies_0BD125F47E2126667F81E460CDDDE771_terseLabel_en-US" xlink:label="lab_efoi_RestructuringAndRelatedCostNumberOfNewProductFamilies_0BD125F47E2126667F81E460CDDDE771" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of new product families </link:label>
<link:label id="lab_efoi_RestructuringAndRelatedCostNumberOfNewProductFamilies_0BD125F47E2126667F81E460CDDDE771_label_en-US" xlink:label="lab_efoi_RestructuringAndRelatedCostNumberOfNewProductFamilies_0BD125F47E2126667F81E460CDDDE771" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructuring And Related Cost, Number Of New Product Families </link:label>
<link:label id="lab_efoi_RestructuringAndRelatedCostNumberOfNewProductFamilies_0BD125F47E2126667F81E460CDDDE771_documentation_en-US" xlink:label="lab_efoi_RestructuringAndRelatedCostNumberOfNewProductFamilies_0BD125F47E2126667F81E460CDDDE771" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Restructuring And Related Cost, Number Of New Product Families </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuringAndRelatedCostNumberOfNewProductFamilies" xlink:label="loc_efoi_RestructuringAndRelatedCostNumberOfNewProductFamilies_0BD125F47E2126667F81E460CDDDE771" xlink:type="locator"/>
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<link:label id="lab_us-gaap_EarningsPerShareAbstract_E55B5624E5A7C936C78CDBE295AE30F8_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract_E55B5624E5A7C936C78CDBE295AE30F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Numerator: </link:label>
<link:label id="lab_us-gaap_EarningsPerShareAbstract_E55B5624E5A7C936C78CDBE295AE30F8_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract_E55B5624E5A7C936C78CDBE295AE30F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Earnings Per Share [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_E55B5624E5A7C936C78CDBE295AE30F8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_A063572BD9B675B1FADBDBE295AEDAD3_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_A063572BD9B675B1FADBDBE295AEDAD3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Basic and diluted weighted average common shares outstanding </link:label>
<link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_A063572BD9B675B1FADBDBE295AEDAD3_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_A063572BD9B675B1FADBDBE295AEDAD3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Weighted Average Number of Shares Outstanding, Basic </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_A063572BD9B675B1FADBDBE295AEDAD3" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTable_B781BFCE97C0810E9E4FC5462FE8A046_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTable_B781BFCE97C0810E9E4FC5462FE8A046" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table] </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTable_B781BFCE97C0810E9E4FC5462FE8A046" xlink:type="locator"/>
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<link:label id="lab_srt_StatementScenarioAxis_F0B1664F71791B9B5440C5462FE8A734_terseLabel_en-US" xlink:label="lab_srt_StatementScenarioAxis_F0B1664F71791B9B5440C5462FE8A734" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Scenario [Axis] </link:label>
<link:label id="lab_srt_StatementScenarioAxis_F0B1664F71791B9B5440C5462FE8A734_label_en-US" xlink:label="lab_srt_StatementScenarioAxis_F0B1664F71791B9B5440C5462FE8A734" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Scenario [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementScenarioAxis" xlink:label="loc_srt_StatementScenarioAxis_F0B1664F71791B9B5440C5462FE8A734" xlink:type="locator"/>
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<link:label id="lab_srt_ScenarioUnspecifiedDomain_25D5F4CE62D43C874E11C5462FED657D_terseLabel_en-US" xlink:label="lab_srt_ScenarioUnspecifiedDomain_25D5F4CE62D43C874E11C5462FED657D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Scenario [Domain] </link:label>
<link:label id="lab_srt_ScenarioUnspecifiedDomain_25D5F4CE62D43C874E11C5462FED657D_label_en-US" xlink:label="lab_srt_ScenarioUnspecifiedDomain_25D5F4CE62D43C874E11C5462FED657D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Scenario [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_25D5F4CE62D43C874E11C5462FED657D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ScenarioUnspecifiedDomain_25D5F4CE62D43C874E11C5462FED657D" xlink:to="lab_srt_ScenarioUnspecifiedDomain_25D5F4CE62D43C874E11C5462FED657D" xlink:type="arc"/>
<link:label id="lab_srt_ScenarioForecastMember_F1E71F11D7E0BD3129C0C5462FEDEFE1_terseLabel_en-US" xlink:label="lab_srt_ScenarioForecastMember_F1E71F11D7E0BD3129C0C5462FEDEFE1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Scenario, forecast </link:label>
<link:label id="lab_srt_ScenarioForecastMember_F1E71F11D7E0BD3129C0C5462FEDEFE1_label_en-US" xlink:label="lab_srt_ScenarioForecastMember_F1E71F11D7E0BD3129C0C5462FEDEFE1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Forecast [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioForecastMember" xlink:label="loc_srt_ScenarioForecastMember_F1E71F11D7E0BD3129C0C5462FEDEFE1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ScenarioForecastMember_F1E71F11D7E0BD3129C0C5462FEDEFE1" xlink:to="lab_srt_ScenarioForecastMember_F1E71F11D7E0BD3129C0C5462FEDEFE1" xlink:type="arc"/>
<link:label id="lab_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_F5FCD2A00B34C7039983C5462FED8A32_terseLabel_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_F5FCD2A00B34C7039983C5462FED8A32" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Business Acquisition, Contingent Consideration [Line Items] </link:label>
<link:label id="lab_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_F5FCD2A00B34C7039983C5462FED8A32_label_en-US" xlink:label="lab_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_F5FCD2A00B34C7039983C5462FED8A32" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Acquisition, Contingent Consideration [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionContingentConsiderationLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_F5FCD2A00B34C7039983C5462FED8A32" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_F5FCD2A00B34C7039983C5462FED8A32" xlink:to="lab_us-gaap_BusinessAcquisitionContingentConsiderationLineItems_F5FCD2A00B34C7039983C5462FED8A32" xlink:type="arc"/>
<link:label id="lab_us-gaap_PurchaseObligation_E2434A0D108BAEF676C6C5462FEDF320_terseLabel_en-US" xlink:label="lab_us-gaap_PurchaseObligation_E2434A0D108BAEF676C6C5462FEDF320" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Outstanding purchase commitment </link:label>
<link:label id="lab_us-gaap_PurchaseObligation_E2434A0D108BAEF676C6C5462FEDF320_label_en-US" xlink:label="lab_us-gaap_PurchaseObligation_E2434A0D108BAEF676C6C5462FEDF320" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Purchase Obligation </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PurchaseObligation" xlink:label="loc_us-gaap_PurchaseObligation_E2434A0D108BAEF676C6C5462FEDF320" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PurchaseObligation_E2434A0D108BAEF676C6C5462FEDF320" xlink:to="lab_us-gaap_PurchaseObligation_E2434A0D108BAEF676C6C5462FEDF320" xlink:type="arc"/>
<link:label id="lab_us-gaap_LongTermPurchaseCommitmentAmount_5A2B3678C5E7EFB7B2DCC5462FEDCDE1_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermPurchaseCommitmentAmount_5A2B3678C5E7EFB7B2DCC5462FEDCDE1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Purchase commitment </link:label>
<link:label id="lab_us-gaap_LongTermPurchaseCommitmentAmount_5A2B3678C5E7EFB7B2DCC5462FEDCDE1_label_en-US" xlink:label="lab_us-gaap_LongTermPurchaseCommitmentAmount_5A2B3678C5E7EFB7B2DCC5462FEDCDE1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Purchase Commitment, Amount </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermPurchaseCommitmentAmount" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentAmount_5A2B3678C5E7EFB7B2DCC5462FEDCDE1" xlink:type="locator"/>
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<link:label id="lab_efoi_DocumentAndEntityInformationAbstract_B4AD230090B4D846D151C546318573BE_label_en-US" xlink:label="lab_efoi_DocumentAndEntityInformationAbstract_B4AD230090B4D846D151C546318573BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Document and Entity Information [Abstract] </link:label>
<link:label id="lab_efoi_DocumentAndEntityInformationAbstract_B4AD230090B4D846D151C546318573BE_documentation_en-US" xlink:label="lab_efoi_DocumentAndEntityInformationAbstract_B4AD230090B4D846D151C546318573BE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"/>
<link:loc xlink:href="efoi-20191231.xsd#efoi_DocumentAndEntityInformationAbstract" xlink:label="loc_efoi_DocumentAndEntityInformationAbstract_B4AD230090B4D846D151C546318573BE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_DocumentAndEntityInformationAbstract_B4AD230090B4D846D151C546318573BE" xlink:to="lab_efoi_DocumentAndEntityInformationAbstract_B4AD230090B4D846D151C546318573BE" xlink:type="arc"/>
<link:label id="lab_dei_EntityRegistrantName_18EAAA72A2F16FAE626BC546318574FD_terseLabel_en-US" xlink:label="lab_dei_EntityRegistrantName_18EAAA72A2F16FAE626BC546318574FD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Registrant Name </link:label>
<link:label id="lab_dei_EntityRegistrantName_18EAAA72A2F16FAE626BC546318574FD_label_en-US" xlink:label="lab_dei_EntityRegistrantName_18EAAA72A2F16FAE626BC546318574FD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Registrant Name </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_18EAAA72A2F16FAE626BC546318574FD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityRegistrantName_18EAAA72A2F16FAE626BC546318574FD" xlink:to="lab_dei_EntityRegistrantName_18EAAA72A2F16FAE626BC546318574FD" xlink:type="arc"/>
<link:label id="lab_dei_EntityCentralIndexKey_C4156AF6BE8592B425DFC54631859CFF_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey_C4156AF6BE8592B425DFC54631859CFF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Central Index Key </link:label>
<link:label id="lab_dei_EntityCentralIndexKey_C4156AF6BE8592B425DFC54631859CFF_label_en-US" xlink:label="lab_dei_EntityCentralIndexKey_C4156AF6BE8592B425DFC54631859CFF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Central Index Key </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_C4156AF6BE8592B425DFC54631859CFF" xlink:type="locator"/>
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<link:label id="lab_dei_CurrentFiscalYearEndDate_FA82C075EC9D0C9F1C09C546318580CC_terseLabel_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate_FA82C075EC9D0C9F1C09C546318580CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current Fiscal Year End Date </link:label>
<link:label id="lab_dei_CurrentFiscalYearEndDate_FA82C075EC9D0C9F1C09C546318580CC_label_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate_FA82C075EC9D0C9F1C09C546318580CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Current Fiscal Year End Date </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_FA82C075EC9D0C9F1C09C546318580CC" xlink:type="locator"/>
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<link:label id="lab_dei_EntityFilerCategory_69DA630EAFF972F219DFC5463185BE4D_terseLabel_en-US" xlink:label="lab_dei_EntityFilerCategory_69DA630EAFF972F219DFC5463185BE4D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Filer Category </link:label>
<link:label id="lab_dei_EntityFilerCategory_69DA630EAFF972F219DFC5463185BE4D_label_en-US" xlink:label="lab_dei_EntityFilerCategory_69DA630EAFF972F219DFC5463185BE4D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Filer Category </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_69DA630EAFF972F219DFC5463185BE4D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFilerCategory_69DA630EAFF972F219DFC5463185BE4D" xlink:to="lab_dei_EntityFilerCategory_69DA630EAFF972F219DFC5463185BE4D" xlink:type="arc"/>
<link:label id="lab_dei_EntityEmergingGrowthCompany_703E06B88E5F80D29250C54631855C91_terseLabel_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany_703E06B88E5F80D29250C54631855C91" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Emerging Growth Company </link:label>
<link:label id="lab_dei_EntityEmergingGrowthCompany_703E06B88E5F80D29250C54631855C91_label_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany_703E06B88E5F80D29250C54631855C91" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Emerging Growth Company </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntityEmergingGrowthCompany" xlink:label="loc_dei_EntityEmergingGrowthCompany_703E06B88E5F80D29250C54631855C91" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityEmergingGrowthCompany_703E06B88E5F80D29250C54631855C91" xlink:to="lab_dei_EntityEmergingGrowthCompany_703E06B88E5F80D29250C54631855C91" xlink:type="arc"/>
<link:label id="lab_dei_EntitySmallBusiness_EF178C5FE2CA20581057C5463185B320_terseLabel_en-US" xlink:label="lab_dei_EntitySmallBusiness_EF178C5FE2CA20581057C5463185B320" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Small Business </link:label>
<link:label id="lab_dei_EntitySmallBusiness_EF178C5FE2CA20581057C5463185B320_label_en-US" xlink:label="lab_dei_EntitySmallBusiness_EF178C5FE2CA20581057C5463185B320" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Small Business </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_EntitySmallBusiness" xlink:label="loc_dei_EntitySmallBusiness_EF178C5FE2CA20581057C5463185B320" xlink:type="locator"/>
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<link:label id="lab_dei_DocumentType_DA3A1DA35323BC3207FCC5463185E5B2_terseLabel_en-US" xlink:label="lab_dei_DocumentType_DA3A1DA35323BC3207FCC5463185E5B2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Document Type </link:label>
<link:label id="lab_dei_DocumentType_DA3A1DA35323BC3207FCC5463185E5B2_label_en-US" xlink:label="lab_dei_DocumentType_DA3A1DA35323BC3207FCC5463185E5B2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Document Type </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_DA3A1DA35323BC3207FCC5463185E5B2" xlink:type="locator"/>
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<link:label id="lab_dei_DocumentPeriodEndDate_D5E1018A31BD5A121111C54631852A3C_terseLabel_en-US" xlink:label="lab_dei_DocumentPeriodEndDate_D5E1018A31BD5A121111C54631852A3C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Document Period End Date </link:label>
<link:label id="lab_dei_DocumentPeriodEndDate_D5E1018A31BD5A121111C54631852A3C_label_en-US" xlink:label="lab_dei_DocumentPeriodEndDate_D5E1018A31BD5A121111C54631852A3C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Document Period End Date </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_D5E1018A31BD5A121111C54631852A3C" xlink:type="locator"/>
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<link:label id="lab_dei_DocumentFiscalYearFocus_7A566DB8BECF3DCA0B4FC5463185CB98_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus_7A566DB8BECF3DCA0B4FC5463185CB98" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Document Fiscal Year Focus </link:label>
<link:label id="lab_dei_DocumentFiscalYearFocus_7A566DB8BECF3DCA0B4FC5463185CB98_label_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus_7A566DB8BECF3DCA0B4FC5463185CB98" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Document Fiscal Year Focus </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_7A566DB8BECF3DCA0B4FC5463185CB98" xlink:type="locator"/>
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<link:label id="lab_dei_DocumentFiscalPeriodFocus_6D90EEF8ED434880BBDBC5463185E9F8_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalPeriodFocus_6D90EEF8ED434880BBDBC5463185E9F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Document Fiscal Period Focus </link:label>
<link:label id="lab_dei_DocumentFiscalPeriodFocus_6D90EEF8ED434880BBDBC5463185E9F8_label_en-US" xlink:label="lab_dei_DocumentFiscalPeriodFocus_6D90EEF8ED434880BBDBC5463185E9F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Document Fiscal Period Focus </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_6D90EEF8ED434880BBDBC5463185E9F8" xlink:type="locator"/>
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<link:label id="lab_dei_AmendmentFlag_54C34E0D3DC91359DA8FC546318560E8_terseLabel_en-US" xlink:label="lab_dei_AmendmentFlag_54C34E0D3DC91359DA8FC546318560E8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amendment Flag </link:label>
<link:label id="lab_dei_AmendmentFlag_54C34E0D3DC91359DA8FC546318560E8_label_en-US" xlink:label="lab_dei_AmendmentFlag_54C34E0D3DC91359DA8FC546318560E8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Amendment Flag </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_54C34E0D3DC91359DA8FC546318560E8" xlink:type="locator"/>
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<link:label id="lab_dei_EntityWellKnownSeasonedIssuer_423FC087BF2F870FC41AC54631852E5E_terseLabel_en-US" xlink:label="lab_dei_EntityWellKnownSeasonedIssuer_423FC087BF2F870FC41AC54631852E5E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Well-known Seasoned Issuer </link:label>
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<link:label id="lab_dei_EntityShellCompany_3D89AEB8EF28F26C07D1C5463188C984_label_en-US" xlink:label="lab_dei_EntityShellCompany_3D89AEB8EF28F26C07D1C5463188C984" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Shell Company </link:label>
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<link:label id="lab_dei_EntityCurrentReportingStatus_F7242640ABBEB5FBC245C54631883DB5_label_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus_F7242640ABBEB5FBC245C54631883DB5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Current Reporting Status </link:label>
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<link:label id="lab_dei_EntityCommonStockSharesOutstanding_A7F32C1C5009476D411BC546318838E1_label_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding_A7F32C1C5009476D411BC546318838E1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Common Stock, Shares Outstanding </link:label>
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<link:label id="lab_dei_EntityPublicFloat_4137878E594D0BEB1665C5463188171C_terseLabel_en-US" xlink:label="lab_dei_EntityPublicFloat_4137878E594D0BEB1665C5463188171C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Public Float </link:label>
<link:label id="lab_dei_EntityPublicFloat_4137878E594D0BEB1665C5463188171C_label_en-US" xlink:label="lab_dei_EntityPublicFloat_4137878E594D0BEB1665C5463188171C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Public Float </link:label>
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<link:label id="lab_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock_57CF5BFC92BA3DA5ACDFC5462ED99E5B_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock_57CF5BFC92BA3DA5ACDFC5462ED99E5B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Breakdown of Product Net Sales </link:label>
<link:label id="lab_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock_57CF5BFC92BA3DA5ACDFC5462ED99E5B_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock_57CF5BFC92BA3DA5ACDFC5462ED99E5B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue from External Customers by Products and Services [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock_57CF5BFC92BA3DA5ACDFC5462ED99E5B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfRevenueFromExternalCustomersAttributedToForeignCountriesByGeographicAreaTextBlock_59BF2CFD48D7838C6A4FC5462EDABFD7_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRevenueFromExternalCustomersAttributedToForeignCountriesByGeographicAreaTextBlock_59BF2CFD48D7838C6A4FC5462EDABFD7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Geographic Summary of Net Sales </link:label>
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<link:label id="lab_us-gaap_LesseeLeaseDescriptionTable_E03EDC79443A3F4635F707CE9C0A2A67_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionTable_E03EDC79443A3F4635F707CE9C0A2A67" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Description [Table] </link:label>
<link:label id="lab_us-gaap_LesseeLeaseDescriptionTable_E03EDC79443A3F4635F707CE9C0A2A67_label_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionTable_E03EDC79443A3F4635F707CE9C0A2A67" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Description [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_E03EDC79443A3F4635F707CE9C0A2A67" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LesseeLeaseDescriptionLineItems_DB6C7FCB8294BD6B997607CE9C0AFFDF_label_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionLineItems_DB6C7FCB8294BD6B997607CE9C0AFFDF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Description [Line Items] </link:label>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseDiscountRate_27041E55A6759BAB95EF07CE9C0E75EB_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseDiscountRate_27041E55A6759BAB95EF07CE9C0E75EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating lease, discount rate </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseDiscountRate_27041E55A6759BAB95EF07CE9C0E75EB_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseDiscountRate_27041E55A6759BAB95EF07CE9C0E75EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Discount Rate </link:label>
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<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_9D66AFE2F62C32F89EE507CE9C0E62DD_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_9D66AFE2F62C32F89EE507CE9C0E62DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating lease, weighted average remaining lease term </link:label>
<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_9D66AFE2F62C32F89EE507CE9C0E62DD_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_9D66AFE2F62C32F89EE507CE9C0E62DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Weighted Average Remaining Lease Term </link:label>
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<link:label id="lab_efoi_RestructuredLeasesOperatingLeaseWeightedAverageRemainingLeaseTerm_B3A1EA997C9D9331E4C807CE9C127FB1_terseLabel_en-US" xlink:label="lab_efoi_RestructuredLeasesOperatingLeaseWeightedAverageRemainingLeaseTerm_B3A1EA997C9D9331E4C807CE9C127FB1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restructured lease, weighted average remaining lease term </link:label>
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<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuredLeasesOperatingLeaseWeightedAverageRemainingLeaseTerm" xlink:label="loc_efoi_RestructuredLeasesOperatingLeaseWeightedAverageRemainingLeaseTerm_B3A1EA997C9D9331E4C807CE9C127FB1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_B803484B85996C08E0EF07CE9C12AB75_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_B803484B85996C08E0EF07CE9C12AB75" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Finance lease, weighted average remaining lease term </link:label>
<link:label id="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_B803484B85996C08E0EF07CE9C12AB75_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_B803484B85996C08E0EF07CE9C12AB75" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Weighted Average Remaining Lease Term </link:label>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentAbstract_0D3B3B261419ACFE3E2ADE47D047B561_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentAbstract_0D3B3B261419ACFE3E2ADE47D047B561" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Abstract] </link:label>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_AB3418F05A6EDE7206CDDE47D048171E_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_AB3418F05A6EDE7206CDDE47D048171E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Property and Equipment </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_AB3418F05A6EDE7206CDDE47D048171E_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_AB3418F05A6EDE7206CDDE47D048171E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_AB3418F05A6EDE7206CDDE47D048171E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_72F05E3BE43E84D440AEC546305737EA_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_72F05E3BE43E84D440AEC546305737EA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Table] </link:label>
<link:label id="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_72F05E3BE43E84D440AEC546305737EA_label_en-US" xlink:label="lab_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_72F05E3BE43E84D440AEC546305737EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_72F05E3BE43E84D440AEC546305737EA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ACC83B8EBC46779F3EA3C54630572379_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ACC83B8EBC46779F3EA3C54630572379" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Axis] </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ACC83B8EBC46779F3EA3C54630572379_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ACC83B8EBC46779F3EA3C54630572379" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ACC83B8EBC46779F3EA3C54630572379" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_779B046BD2610A8DECBBC5463057789F_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_779B046BD2610A8DECBBC5463057789F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Domain] </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_779B046BD2610A8DECBBC5463057789F_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_779B046BD2610A8DECBBC5463057789F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_779B046BD2610A8DECBBC5463057789F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_EquipmentMember_FB17A558F3412E5F0ABFC5463057B273_terseLabel_en-US" xlink:label="lab_us-gaap_EquipmentMember_FB17A558F3412E5F0ABFC5463057B273" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Equipment </link:label>
<link:label id="lab_us-gaap_EquipmentMember_FB17A558F3412E5F0ABFC5463057B273_label_en-US" xlink:label="lab_us-gaap_EquipmentMember_FB17A558F3412E5F0ABFC5463057B273" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equipment [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquipmentMember" xlink:label="loc_us-gaap_EquipmentMember_FB17A558F3412E5F0ABFC5463057B273" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquipmentMember_FB17A558F3412E5F0ABFC5463057B273" xlink:to="lab_us-gaap_EquipmentMember_FB17A558F3412E5F0ABFC5463057B273" xlink:type="arc"/>
<link:label id="lab_efoi_ToolingMember_B996BF9A1DA2CFC5C03EC54630570A66_terseLabel_en-US" xlink:label="lab_efoi_ToolingMember_B996BF9A1DA2CFC5C03EC54630570A66" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Tooling </link:label>
<link:label id="lab_efoi_ToolingMember_B996BF9A1DA2CFC5C03EC54630570A66_label_en-US" xlink:label="lab_efoi_ToolingMember_B996BF9A1DA2CFC5C03EC54630570A66" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Tooling [Member] </link:label>
<link:label id="lab_efoi_ToolingMember_B996BF9A1DA2CFC5C03EC54630570A66_documentation_en-US" xlink:label="lab_efoi_ToolingMember_B996BF9A1DA2CFC5C03EC54630570A66" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"/>
<link:loc xlink:href="efoi-20191231.xsd#efoi_ToolingMember" xlink:label="loc_efoi_ToolingMember_B996BF9A1DA2CFC5C03EC54630570A66" xlink:type="locator"/>
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<link:label id="lab_us-gaap_VehiclesMember_B78C4A63CBF86A2C8291C5463057FD3E_terseLabel_en-US" xlink:label="lab_us-gaap_VehiclesMember_B78C4A63CBF86A2C8291C5463057FD3E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vehicles </link:label>
<link:label id="lab_us-gaap_VehiclesMember_B78C4A63CBF86A2C8291C5463057FD3E_label_en-US" xlink:label="lab_us-gaap_VehiclesMember_B78C4A63CBF86A2C8291C5463057FD3E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Vehicles [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VehiclesMember" xlink:label="loc_us-gaap_VehiclesMember_B78C4A63CBF86A2C8291C5463057FD3E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FurnitureAndFixturesMember_BC11B8E3D7029C1D4CD7C5463057B554_terseLabel_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesMember_BC11B8E3D7029C1D4CD7C5463057B554" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Furniture and fixtures </link:label>
<link:label id="lab_us-gaap_FurnitureAndFixturesMember_BC11B8E3D7029C1D4CD7C5463057B554_label_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesMember_BC11B8E3D7029C1D4CD7C5463057B554" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Furniture and Fixtures [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_BC11B8E3D7029C1D4CD7C5463057B554" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_C4366EE9E14F1E6035CDC54630570CD1_terseLabel_en-US" xlink:label="lab_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_C4366EE9E14F1E6035CDC54630570CD1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Computer software </link:label>
<link:label id="lab_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_C4366EE9E14F1E6035CDC54630570CD1_label_en-US" xlink:label="lab_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_C4366EE9E14F1E6035CDC54630570CD1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Software and Software Development Costs [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_C4366EE9E14F1E6035CDC54630570CD1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_C4366EE9E14F1E6035CDC54630570CD1" xlink:to="lab_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_C4366EE9E14F1E6035CDC54630570CD1" xlink:type="arc"/>
<link:label id="lab_us-gaap_LeaseholdImprovementsMember_07158311E294A0B5AB49C5463057A893_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsMember_07158311E294A0B5AB49C5463057A893" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Leasehold improvements </link:label>
<link:label id="lab_us-gaap_LeaseholdImprovementsMember_07158311E294A0B5AB49C5463057A893_label_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsMember_07158311E294A0B5AB49C5463057A893" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Leasehold Improvements [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_07158311E294A0B5AB49C5463057A893" xlink:type="locator"/>
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<link:label id="lab_efoi_FinanceLeaseRightOfUseAssetMember_407EB2550B52A590D4CDC546305776DD_terseLabel_en-US" xlink:label="lab_efoi_FinanceLeaseRightOfUseAssetMember_407EB2550B52A590D4CDC546305776DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Finance lease right-of-use asset </link:label>
<link:label id="lab_efoi_FinanceLeaseRightOfUseAssetMember_407EB2550B52A590D4CDC546305776DD_label_en-US" xlink:label="lab_efoi_FinanceLeaseRightOfUseAssetMember_407EB2550B52A590D4CDC546305776DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Right Of Use Asset [Member] </link:label>
<link:label id="lab_efoi_FinanceLeaseRightOfUseAssetMember_407EB2550B52A590D4CDC546305776DD_documentation_en-US" xlink:label="lab_efoi_FinanceLeaseRightOfUseAssetMember_407EB2550B52A590D4CDC546305776DD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Finance Lease, Right Of Use Asset [Member] </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_FinanceLeaseRightOfUseAssetMember" xlink:label="loc_efoi_FinanceLeaseRightOfUseAssetMember_407EB2550B52A590D4CDC546305776DD" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ConstructionInProgressMember_7BFD5C87876BAB1DABE8C5463057A4F9_terseLabel_en-US" xlink:label="lab_us-gaap_ConstructionInProgressMember_7BFD5C87876BAB1DABE8C5463057A4F9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Construction in progress </link:label>
<link:label id="lab_us-gaap_ConstructionInProgressMember_7BFD5C87876BAB1DABE8C5463057A4F9_label_en-US" xlink:label="lab_us-gaap_ConstructionInProgressMember_7BFD5C87876BAB1DABE8C5463057A4F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Construction in Progress [Member] </link:label>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_63213739A75AF5295222C546305B8934_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems_63213739A75AF5295222C546305B8934" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Line Items] </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_63213739A75AF5295222C546305B8934_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems_63213739A75AF5295222C546305B8934" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_63213739A75AF5295222C546305B8934" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_B86EEE0AA5C976A137A0C546305B952D_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_B86EEE0AA5C976A137A0C546305B952D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property and equipment at cost </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_B86EEE0AA5C976A137A0C546305B952D_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_B86EEE0AA5C976A137A0C546305B952D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Gross </link:label>
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<link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_E4D3E0F0D200DDF3A7CFC546305B06B9_negatedLabel_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_E4D3E0F0D200DDF3A7CFC546305B06B9" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Less: accumulated depreciation </link:label>
<link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_E4D3E0F0D200DDF3A7CFC546305B06B9_label_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_E4D3E0F0D200DDF3A7CFC546305B06B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment </link:label>
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<link:label id="lab_efoi_A13DGroupMember_F21D03102D2E8F7EC816C59C209EDD2F_terseLabel_en-US" xlink:label="lab_efoi_A13DGroupMember_F21D03102D2E8F7EC816C59C209EDD2F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 13D Group </link:label>
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<link:loc xlink:href="efoi-20191231.xsd#efoi_A13DGroupMember" xlink:label="loc_efoi_A13DGroupMember_F21D03102D2E8F7EC816C59C209EDD2F" xlink:type="locator"/>
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<link:label id="lab_efoi_CommunalMember_EE07D8AD551A9CA01F29C59C209E6367_terseLabel_en-US" xlink:label="lab_efoi_CommunalMember_EE07D8AD551A9CA01F29C59C209E6367" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Communal </link:label>
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<link:label id="lab_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1492B68CE7E7FE511F9AC59C209E5AD8_terseLabel_en-US" xlink:label="lab_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1492B68CE7E7FE511F9AC59C209E5AD8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Investment, Name [Axis] </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_17151B0E9B5DABE5A38AE10F2B5F8488_negatedLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_17151B0E9B5DABE5A38AE10F2B5F8488" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Canceled (in shares) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_17151B0E9B5DABE5A38AE10F2B5F8488_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_17151B0E9B5DABE5A38AE10F2B5F8488" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_360DB8499498989C2240E10F2B5F9B1A_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_360DB8499498989C2240E10F2B5F9B1A" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Ending balance (in shares) </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_6DCD1D824A9C80CC3286E10F2B5F1B59_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_6DCD1D824A9C80CC3286E10F2B5F1B59" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted Average Grant Date Fair Value </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_6DCD1D824A9C80CC3286E10F2B5F1B59_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_6DCD1D824A9C80CC3286E10F2B5F1B59" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_6553009352FA1D92346FE10F2B5F8A20_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_6553009352FA1D92346FE10F2B5F8A20" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Outstanding at beginning of period (in dollars per share) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_6553009352FA1D92346FE10F2B5F8A20_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_6553009352FA1D92346FE10F2B5F8A20" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_6553009352FA1D92346FE10F2B5F8A20" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_BF1129B01580B5F10977E10F2B5FDD67_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_BF1129B01580B5F10977E10F2B5FDD67" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Granted (in dollars per share) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_BF1129B01580B5F10977E10F2B5FDD67_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_BF1129B01580B5F10977E10F2B5FDD67" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_BF1129B01580B5F10977E10F2B5FDD67" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_94386E53572D04E56ECEE10F2B5F1D7D_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_94386E53572D04E56ECEE10F2B5F1D7D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vested (in dollars per share) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_94386E53572D04E56ECEE10F2B5F1D7D_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_94386E53572D04E56ECEE10F2B5F1D7D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_94386E53572D04E56ECEE10F2B5F1D7D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_851C54595D4F9C41DC64E10F2B5F84A6_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_851C54595D4F9C41DC64E10F2B5F84A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Canceled (in dollars per share) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_851C54595D4F9C41DC64E10F2B5F84A6_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_851C54595D4F9C41DC64E10F2B5F84A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_851C54595D4F9C41DC64E10F2B5F84A6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_7CA93680F8BD5C43CA36E10F2B5F9440_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_7CA93680F8BD5C43CA36E10F2B5F9440" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Outstanding at end of period (in dollars per share) </link:label>
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<link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_29FFAB4AB0673EF9861C07CE9CF48408_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_29FFAB4AB0673EF9861C07CE9CF48408" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Cash Flows [Abstract] </link:label>
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<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_C410E6CC642915C671FE07CE9CF44201_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_C410E6CC642915C671FE07CE9CF44201" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash flows from operating activities: </link:label>
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<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_F92A35EB6AD4138A985707CE9CF4355B_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_F92A35EB6AD4138A985707CE9CF4355B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Adjustments to reconcile net loss to net cash used in operating activities: </link:label>
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<link:label id="lab_efoi_SharebasedCompensationReversal_3D3087C657E827B08AC407CE9CF4E9C0_negatedTerseLabel_en-US" xlink:label="lab_efoi_SharebasedCompensationReversal_3D3087C657E827B08AC407CE9CF4E9C0" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Stock-based compensation reversal </link:label>
<link:label id="lab_efoi_SharebasedCompensationReversal_3D3087C657E827B08AC407CE9CF4E9C0_label_en-US" xlink:label="lab_efoi_SharebasedCompensationReversal_3D3087C657E827B08AC407CE9CF4E9C0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation, Reversal </link:label>
<link:label id="lab_efoi_SharebasedCompensationReversal_3D3087C657E827B08AC407CE9CF4E9C0_documentation_en-US" xlink:label="lab_efoi_SharebasedCompensationReversal_3D3087C657E827B08AC407CE9CF4E9C0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation, Reversal </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_SharebasedCompensationReversal" xlink:label="loc_efoi_SharebasedCompensationReversal_3D3087C657E827B08AC407CE9CF4E9C0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProvisionForDoubtfulAccounts_E19396F3F7811043F8AB07CE9CF4C855_terseLabel_en-US" xlink:label="lab_us-gaap_ProvisionForDoubtfulAccounts_E19396F3F7811043F8AB07CE9CF4C855" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Provision for doubtful accounts receivable </link:label>
<link:label id="lab_us-gaap_ProvisionForDoubtfulAccounts_E19396F3F7811043F8AB07CE9CF4C855_label_en-US" xlink:label="lab_us-gaap_ProvisionForDoubtfulAccounts_E19396F3F7811043F8AB07CE9CF4C855" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, Credit Loss Expense (Reversal) </link:label>
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<link:label id="lab_efoi_IncreaseDecreaseInInventoryReserves_5BEBF5A3BE9794D7AF2D07CE9CF80E12_negatedTerseLabel_en-US" xlink:label="lab_efoi_IncreaseDecreaseInInventoryReserves_5BEBF5A3BE9794D7AF2D07CE9CF80E12" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Provision for slow-moving and obsolete inventories </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_IncreaseDecreaseInInventoryReserves" xlink:label="loc_efoi_IncreaseDecreaseInInventoryReserves_5BEBF5A3BE9794D7AF2D07CE9CF80E12" xlink:type="locator"/>
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<link:label id="lab_efoi_IncreaseDecreaseInProvisionForWarranties_ED4200FD4572A6A76CCD07CE9CF85FC8_terseLabel_en-US" xlink:label="lab_efoi_IncreaseDecreaseInProvisionForWarranties_ED4200FD4572A6A76CCD07CE9CF85FC8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Provision for warranties </link:label>
<link:label id="lab_efoi_IncreaseDecreaseInProvisionForWarranties_ED4200FD4572A6A76CCD07CE9CF85FC8_label_en-US" xlink:label="lab_efoi_IncreaseDecreaseInProvisionForWarranties_ED4200FD4572A6A76CCD07CE9CF85FC8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) In Provision For Warranties </link:label>
<link:label id="lab_efoi_IncreaseDecreaseInProvisionForWarranties_ED4200FD4572A6A76CCD07CE9CF85FC8_documentation_en-US" xlink:label="lab_efoi_IncreaseDecreaseInProvisionForWarranties_ED4200FD4572A6A76CCD07CE9CF85FC8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) In Provision For Warranties </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_IncreaseDecreaseInProvisionForWarranties" xlink:label="loc_efoi_IncreaseDecreaseInProvisionForWarranties_ED4200FD4572A6A76CCD07CE9CF85FC8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AmortizationOfDebtDiscountPremium_837DBAA0EBD46A1463FD07CE9CF82554_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfDebtDiscountPremium_837DBAA0EBD46A1463FD07CE9CF82554" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amortization of discounts on the Iliad Note </link:label>
<link:label id="lab_us-gaap_AmortizationOfDebtDiscountPremium_837DBAA0EBD46A1463FD07CE9CF82554_label_en-US" xlink:label="lab_us-gaap_AmortizationOfDebtDiscountPremium_837DBAA0EBD46A1463FD07CE9CF82554" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Amortization of Debt Discount (Premium) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfDebtDiscountPremium" xlink:label="loc_us-gaap_AmortizationOfDebtDiscountPremium_837DBAA0EBD46A1463FD07CE9CF82554" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AmortizationOfDeferredLoanOriginationFeesNet_59F25A1D3F26F606DA4E07CE9CF8CB76_negatedLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfDeferredLoanOriginationFeesNet_59F25A1D3F26F606DA4E07CE9CF8CB76" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Amortization of loan origination fees </link:label>
<link:label id="lab_us-gaap_AmortizationOfDeferredLoanOriginationFeesNet_59F25A1D3F26F606DA4E07CE9CF8CB76_label_en-US" xlink:label="lab_us-gaap_AmortizationOfDeferredLoanOriginationFeesNet_59F25A1D3F26F606DA4E07CE9CF8CB76" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Amortization of Deferred Loan Origination Fees, Net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfDeferredLoanOriginationFeesNet" xlink:label="loc_us-gaap_AmortizationOfDeferredLoanOriginationFeesNet_59F25A1D3F26F606DA4E07CE9CF8CB76" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_E1485B3E98321861DE7E07CE9CF8C073_negatedLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_E1485B3E98321861DE7E07CE9CF8C073" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Loss on dispositions of property and equipment </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_E1485B3E98321861DE7E07CE9CF8C073" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AC0C06D62F5FE73B913A07CE9CF8AF45_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AC0C06D62F5FE73B913A07CE9CF8AF45" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Change in operating assets and liabilities: </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AC0C06D62F5FE73B913A07CE9CF8AF45_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AC0C06D62F5FE73B913A07CE9CF8AF45" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Operating Capital [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_AC0C06D62F5FE73B913A07CE9CF8AF45" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_0900581FE9DD9867B84607CE9CF8122F_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_0900581FE9DD9867B84607CE9CF8122F" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Accounts receivable </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_0900581FE9DD9867B84607CE9CF8122F_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_0900581FE9DD9867B84607CE9CF8122F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Accounts Receivable </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_0900581FE9DD9867B84607CE9CF8122F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInInventories_8C1EAF9F07F5DC186D9D07CE9CF8306C_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_8C1EAF9F07F5DC186D9D07CE9CF8306C" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Inventories </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInInventories_8C1EAF9F07F5DC186D9D07CE9CF8306C_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_8C1EAF9F07F5DC186D9D07CE9CF8306C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Inventories </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_8C1EAF9F07F5DC186D9D07CE9CF8306C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_19180676C1A7BB50455307CE9CF88107_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_19180676C1A7BB50455307CE9CF88107" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Prepaid and other assets </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_19180676C1A7BB50455307CE9CF88107_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_19180676C1A7BB50455307CE9CF88107" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Prepaid Expense and Other Assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_19180676C1A7BB50455307CE9CF88107" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_8402A909C43230DE570307CE9CF8A8BB_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_8402A909C43230DE570307CE9CF8A8BB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts payable </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_8402A909C43230DE570307CE9CF8A8BB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_1A01B57D3F6721C34DB407CE9CF8B044_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_1A01B57D3F6721C34DB407CE9CF8B044" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued and other liabilities </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_1A01B57D3F6721C34DB407CE9CF8B044_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_1A01B57D3F6721C34DB407CE9CF8B044" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Accrued Liabilities </link:label>
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<link:label id="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_C20861A094C3443F660A07CE9CF82D2A_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_C20861A094C3443F660A07CE9CF82D2A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred revenue </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_C20861A094C3443F660A07CE9CF82D2A_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_C20861A094C3443F660A07CE9CF82D2A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Deferred Revenue </link:label>
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<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_B4DFF84746E28C97326207CE9CF89C5F_totalLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_B4DFF84746E28C97326207CE9CF89C5F" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total adjustments </link:label>
<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_B4DFF84746E28C97326207CE9CF89C5F_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_B4DFF84746E28C97326207CE9CF89C5F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_B4DFF84746E28C97326207CE9CF89C5F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_91A062BFA7123CB326C507CE9CF8610B_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_91A062BFA7123CB326C507CE9CF8610B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash used in operating activities </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_91A062BFA7123CB326C507CE9CF8610B_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_91A062BFA7123CB326C507CE9CF8610B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Operating Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_91A062BFA7123CB326C507CE9CF8610B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_91A062BFA7123CB326C507CE9CF8610B" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_91A062BFA7123CB326C507CE9CF8610B" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_AF8EF6B82B5957C8DD3C07CE9CF80BA1_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_AF8EF6B82B5957C8DD3C07CE9CF80BA1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash flows from investing activities: </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_AF8EF6B82B5957C8DD3C07CE9CF80BA1_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_AF8EF6B82B5957C8DD3C07CE9CF80BA1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Investing Activities [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_AF8EF6B82B5957C8DD3C07CE9CF80BA1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_AF8EF6B82B5957C8DD3C07CE9CF80BA1" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_AF8EF6B82B5957C8DD3C07CE9CF80BA1" xlink:type="arc"/>
<link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_1BA3837283C368F08D3007CE9CF87FED_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_1BA3837283C368F08D3007CE9CF87FED" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Acquisitions of property and equipment </link:label>
<link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_1BA3837283C368F08D3007CE9CF87FED_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_1BA3837283C368F08D3007CE9CF87FED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Acquire Property, Plant, and Equipment </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_1BA3837283C368F08D3007CE9CF87FED" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_1BA3837283C368F08D3007CE9CF87FED" xlink:to="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_1BA3837283C368F08D3007CE9CF87FED" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromSalesOfAssetsInvestingActivities_1F80B34C400AAA56D52D07CE9CFC483C_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSalesOfAssetsInvestingActivities_1F80B34C400AAA56D52D07CE9CFC483C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from the sale of property and equipment </link:label>
<link:label id="lab_us-gaap_ProceedsFromSalesOfAssetsInvestingActivities_1F80B34C400AAA56D52D07CE9CFC483C_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSalesOfAssetsInvestingActivities_1F80B34C400AAA56D52D07CE9CFC483C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Sales of Assets, Investing Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromSalesOfAssetsInvestingActivities" xlink:label="loc_us-gaap_ProceedsFromSalesOfAssetsInvestingActivities_1F80B34C400AAA56D52D07CE9CFC483C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromSalesOfAssetsInvestingActivities_1F80B34C400AAA56D52D07CE9CFC483C" xlink:to="lab_us-gaap_ProceedsFromSalesOfAssetsInvestingActivities_1F80B34C400AAA56D52D07CE9CFC483C" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_CE31286B5C14918A3F7F07CE9CFC3F2C_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_CE31286B5C14918A3F7F07CE9CFC3F2C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash (used in) provided by investing activities </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_CE31286B5C14918A3F7F07CE9CFC3F2C_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_CE31286B5C14918A3F7F07CE9CFC3F2C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Investing Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_CE31286B5C14918A3F7F07CE9CFC3F2C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_CE31286B5C14918A3F7F07CE9CFC3F2C" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_CE31286B5C14918A3F7F07CE9CFC3F2C" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0569B40626BFA6D4838F07CE9CFC07CE_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0569B40626BFA6D4838F07CE9CFC07CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash flows from financing activities: </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0569B40626BFA6D4838F07CE9CFC07CE_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0569B40626BFA6D4838F07CE9CFC07CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Financing Activities [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0569B40626BFA6D4838F07CE9CFC07CE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0569B40626BFA6D4838F07CE9CFC07CE" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0569B40626BFA6D4838F07CE9CFC07CE" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromStockOptionsExercised_4D773B4593DF8A79373207CE9CFC7E4C_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromStockOptionsExercised_4D773B4593DF8A79373207CE9CFC7E4C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from exercise of stock options and purchases through employee stock purchase plan </link:label>
<link:label id="lab_us-gaap_ProceedsFromStockOptionsExercised_4D773B4593DF8A79373207CE9CFC7E4C_label_en-US" xlink:label="lab_us-gaap_ProceedsFromStockOptionsExercised_4D773B4593DF8A79373207CE9CFC7E4C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Stock Options Exercised </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_4D773B4593DF8A79373207CE9CFC7E4C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromStockOptionsExercised_4D773B4593DF8A79373207CE9CFC7E4C" xlink:to="lab_us-gaap_ProceedsFromStockOptionsExercised_4D773B4593DF8A79373207CE9CFC7E4C" xlink:type="arc"/>
<link:label id="lab_us-gaap_FinanceLeasePrincipalPayments_F3F3F6C856A475B18F1A07CE9CFC83EA_negatedLabel_en-US" xlink:label="lab_us-gaap_FinanceLeasePrincipalPayments_F3F3F6C856A475B18F1A07CE9CFC83EA" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Principal payments under finance lease obligations </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeasePrincipalPayments" xlink:label="loc_us-gaap_FinanceLeasePrincipalPayments_F3F3F6C856A475B18F1A07CE9CFC83EA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinanceLeasePrincipalPayments_F3F3F6C856A475B18F1A07CE9CFC83EA" xlink:to="lab_us-gaap_FinanceLeasePrincipalPayments_F3F3F6C856A475B18F1A07CE9CFC83EA" xlink:type="arc"/>
<link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_198BE560F0930F26273A07CE9CFC5798_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_198BE560F0930F26273A07CE9CFC5798" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Common stock withheld in lieu of income tax withholding on vesting of restricted stock units </link:label>
<link:label id="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_198BE560F0930F26273A07CE9CFC5798_label_en-US" xlink:label="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_198BE560F0930F26273A07CE9CFC5798" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payment, Tax Withholding, Share-based Payment Arrangement </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_198BE560F0930F26273A07CE9CFC5798" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_198BE560F0930F26273A07CE9CFC5798" xlink:to="lab_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_198BE560F0930F26273A07CE9CFC5798" xlink:type="arc"/>
<link:label id="lab_us-gaap_PaymentsOfLoanCosts_5C1D7372D3518707113407CE9CFC93D7_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfLoanCosts_5C1D7372D3518707113407CE9CFC93D7" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Loan origination fees </link:label>
<link:label id="lab_us-gaap_PaymentsOfLoanCosts_5C1D7372D3518707113407CE9CFC93D7_label_en-US" xlink:label="lab_us-gaap_PaymentsOfLoanCosts_5C1D7372D3518707113407CE9CFC93D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments of Loan Costs </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsOfLoanCosts" xlink:label="loc_us-gaap_PaymentsOfLoanCosts_5C1D7372D3518707113407CE9CFC93D7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProceedsFromOtherDebt_AC36CE699EDF07A8B16007CE9CFCC421_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromOtherDebt_AC36CE699EDF07A8B16007CE9CFCC421" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from the Iliad Note </link:label>
<link:label id="lab_us-gaap_ProceedsFromOtherDebt_AC36CE699EDF07A8B16007CE9CFCC421_label_en-US" xlink:label="lab_us-gaap_ProceedsFromOtherDebt_AC36CE699EDF07A8B16007CE9CFCC421" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Other Debt </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromOtherDebt" xlink:label="loc_us-gaap_ProceedsFromOtherDebt_AC36CE699EDF07A8B16007CE9CFCC421" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProceedsFromConvertibleDebt_6E05EAB07FC554F1241C07CE9CFC0B1C_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromConvertibleDebt_6E05EAB07FC554F1241C07CE9CFC0B1C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from convertible notes </link:label>
<link:label id="lab_us-gaap_ProceedsFromConvertibleDebt_6E05EAB07FC554F1241C07CE9CFC0B1C_label_en-US" xlink:label="lab_us-gaap_ProceedsFromConvertibleDebt_6E05EAB07FC554F1241C07CE9CFC0B1C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Convertible Debt </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromConvertibleDebt" xlink:label="loc_us-gaap_ProceedsFromConvertibleDebt_6E05EAB07FC554F1241C07CE9CFC0B1C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromConvertibleDebt_6E05EAB07FC554F1241C07CE9CFC0B1C" xlink:to="lab_us-gaap_ProceedsFromConvertibleDebt_6E05EAB07FC554F1241C07CE9CFC0B1C" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_D677519D96367AA67C2E07CE9CFCEEAF_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_D677519D96367AA67C2E07CE9CFCEEAF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net (payments on) proceeds from credit line borrowings </link:label>
<link:label id="lab_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_D677519D96367AA67C2E07CE9CFCEEAF_label_en-US" xlink:label="lab_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_D677519D96367AA67C2E07CE9CFCEEAF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from (Repayments of) Lines of Credit </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_D677519D96367AA67C2E07CE9CFCEEAF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_D677519D96367AA67C2E07CE9CFCEEAF" xlink:to="lab_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_D677519D96367AA67C2E07CE9CFCEEAF" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_5F80932B8C34974464D307CE9CFCAB7D_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_5F80932B8C34974464D307CE9CFCAB7D" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash provided by financing activities </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_5F80932B8C34974464D307CE9CFCAB7D_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_5F80932B8C34974464D307CE9CFCAB7D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Financing Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_5F80932B8C34974464D307CE9CFCAB7D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_5F80932B8C34974464D307CE9CFCAB7D" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_5F80932B8C34974464D307CE9CFCAB7D" xlink:type="arc"/>
<link:label id="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_FFF093D9C83FC349EBCE07CE9CFC75A3_terseLabel_en-US" xlink:label="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_FFF093D9C83FC349EBCE07CE9CFC75A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Effect of exchange rate changes on cash </link:label>
<link:label id="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_FFF093D9C83FC349EBCE07CE9CFC75A3_label_en-US" xlink:label="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_FFF093D9C83FC349EBCE07CE9CFC75A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_FFF093D9C83FC349EBCE07CE9CFC75A3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_FFF093D9C83FC349EBCE07CE9CFC75A3" xlink:to="lab_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_FFF093D9C83FC349EBCE07CE9CFC75A3" xlink:type="arc"/>
<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_CF3456D206EA4D84D8E607CE9CFCFF43_totalLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_CF3456D206EA4D84D8E607CE9CFCFF43" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net decrease in cash and restricted cash </link:label>
<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_CF3456D206EA4D84D8E607CE9CFCFF43_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_CF3456D206EA4D84D8E607CE9CFCFF43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_CF3456D206EA4D84D8E607CE9CFCFF43" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_CF3456D206EA4D84D8E607CE9CFCFF43" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_CF3456D206EA4D84D8E607CE9CFCFF43" xlink:type="arc"/>
<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_1B7DD956349BDFB1921B07CE9CFC0DBE_periodStartLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_1B7DD956349BDFB1921B07CE9CFC0DBE" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Cash and restricted cash, beginning of year </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_1B7DD956349BDFB1921B07CE9CFC0DBE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_1B7DD956349BDFB1921B07CE9CFC0DBE" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_1B7DD956349BDFB1921B07CE9CFC0DBE" xlink:type="arc"/>
<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D7E62253DD73AC958FF307CE9CFC5C77_periodEndLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D7E62253DD73AC958FF307CE9CFC5C77" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Cash and restricted cash, end of year </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D7E62253DD73AC958FF307CE9CFC5C77" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D7E62253DD73AC958FF307CE9CFC5C77" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_D7E62253DD73AC958FF307CE9CFC5C77" xlink:type="arc"/>
<link:label id="lab_us-gaap_CashAndCashEquivalentsAbstract_C495D273550AB046417707CE9D00869C_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAbstract_C495D273550AB046417707CE9D00869C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Classification of cash and restricted cash: </link:label>
<link:label id="lab_us-gaap_CashAndCashEquivalentsAbstract_C495D273550AB046417707CE9D00869C_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAbstract_C495D273550AB046417707CE9D00869C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash and Cash Equivalents [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAbstract" xlink:label="loc_us-gaap_CashAndCashEquivalentsAbstract_C495D273550AB046417707CE9D00869C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAbstract_C495D273550AB046417707CE9D00869C" xlink:to="lab_us-gaap_CashAndCashEquivalentsAbstract_C495D273550AB046417707CE9D00869C" xlink:type="arc"/>
<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_16DAD9CF980B9D60D83707CE9D00AA37_verboseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_16DAD9CF980B9D60D83707CE9D00AA37" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Cash </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_16DAD9CF980B9D60D83707CE9D00AA37" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_16DAD9CF980B9D60D83707CE9D00AA37" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_16DAD9CF980B9D60D83707CE9D00AA37" xlink:type="arc"/>
<link:label id="lab_us-gaap_RestrictedCashAndCashEquivalents_B198D9A5DFFBB0B5ED2507CE9D0091B3_verboseLabel_en-US" xlink:label="lab_us-gaap_RestrictedCashAndCashEquivalents_B198D9A5DFFBB0B5ED2507CE9D0091B3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Restricted cash held in other assets </link:label>
<link:label id="lab_us-gaap_RestrictedCashAndCashEquivalents_B198D9A5DFFBB0B5ED2507CE9D0091B3_label_en-US" xlink:label="lab_us-gaap_RestrictedCashAndCashEquivalents_B198D9A5DFFBB0B5ED2507CE9D0091B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restricted Cash and Cash Equivalents </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalents" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_B198D9A5DFFBB0B5ED2507CE9D0091B3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalents_B198D9A5DFFBB0B5ED2507CE9D0091B3" xlink:to="lab_us-gaap_RestrictedCashAndCashEquivalents_B198D9A5DFFBB0B5ED2507CE9D0091B3" xlink:type="arc"/>
<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_32CE6DB1202C77366C8107CE9D00B7F5_totalLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_32CE6DB1202C77366C8107CE9D00B7F5" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Cash and restricted cash </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_32CE6DB1202C77366C8107CE9D00B7F5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_32CE6DB1202C77366C8107CE9D00B7F5" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_32CE6DB1202C77366C8107CE9D00B7F5" xlink:type="arc"/>
<link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_0B2BA3DBEA63E14D3C6D07CE9D00E5B7_terseLabel_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_0B2BA3DBEA63E14D3C6D07CE9D00E5B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Supplemental information: </link:label>
<link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_0B2BA3DBEA63E14D3C6D07CE9D00E5B7_label_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_0B2BA3DBEA63E14D3C6D07CE9D00E5B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Supplemental Cash Flow Information [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_0B2BA3DBEA63E14D3C6D07CE9D00E5B7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_0B2BA3DBEA63E14D3C6D07CE9D00E5B7" xlink:to="lab_us-gaap_SupplementalCashFlowInformationAbstract_0B2BA3DBEA63E14D3C6D07CE9D00E5B7" xlink:type="arc"/>
<link:label id="lab_us-gaap_InterestPaidNet_E0069D8E323B808E0A2507CE9D003707_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaidNet_E0069D8E323B808E0A2507CE9D003707" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash paid in year for interest </link:label>
<link:label id="lab_us-gaap_InterestPaidNet_E0069D8E323B808E0A2507CE9D003707_label_en-US" xlink:label="lab_us-gaap_InterestPaidNet_E0069D8E323B808E0A2507CE9D003707" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Paid, Excluding Capitalized Interest, Operating Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestPaidNet" xlink:label="loc_us-gaap_InterestPaidNet_E0069D8E323B808E0A2507CE9D003707" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestPaidNet_E0069D8E323B808E0A2507CE9D003707" xlink:to="lab_us-gaap_InterestPaidNet_E0069D8E323B808E0A2507CE9D003707" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncomeTaxesPaid_93B6DFB57A263AC8A42C07CE9D0089DB_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaid_93B6DFB57A263AC8A42C07CE9D0089DB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash paid in year for income taxes </link:label>
<link:label id="lab_us-gaap_IncomeTaxesPaid_93B6DFB57A263AC8A42C07CE9D0089DB_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaid_93B6DFB57A263AC8A42C07CE9D0089DB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Taxes Paid </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxesPaid" xlink:label="loc_us-gaap_IncomeTaxesPaid_93B6DFB57A263AC8A42C07CE9D0089DB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxesPaid_93B6DFB57A263AC8A42C07CE9D0089DB" xlink:to="lab_us-gaap_IncomeTaxesPaid_93B6DFB57A263AC8A42C07CE9D0089DB" xlink:type="arc"/>
<link:label id="lab_us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock_967F8EEC45B6DA9AD853DE4FAF0D59E1_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock_967F8EEC45B6DA9AD853DE4FAF0D59E1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Prepaid and Other Current Assets </link:label>
<link:label id="lab_us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock_967F8EEC45B6DA9AD853DE4FAF0D59E1_label_en-US" xlink:label="lab_us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock_967F8EEC45B6DA9AD853DE4FAF0D59E1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock" xlink:label="loc_us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock_967F8EEC45B6DA9AD853DE4FAF0D59E1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock_967F8EEC45B6DA9AD853DE4FAF0D59E1" xlink:to="lab_us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock_967F8EEC45B6DA9AD853DE4FAF0D59E1" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_C5BBD720F77B96E3AE51C5B5443FE430_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_C5BBD720F77B96E3AE51C5B5443FE430" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating lease, right-of-use asset </link:label>
<link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_C5BBD720F77B96E3AE51C5B5443FE430_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_C5BBD720F77B96E3AE51C5B5443FE430" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Right-of-Use Asset </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_C5BBD720F77B96E3AE51C5B5443FE430" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseRightOfUseAsset_C5BBD720F77B96E3AE51C5B5443FE430" xlink:to="lab_us-gaap_OperatingLeaseRightOfUseAsset_C5BBD720F77B96E3AE51C5B5443FE430" xlink:type="arc"/>
<link:label id="lab_efoi_RestructuredOperatingLeaseRightOfUseAsset_2109C02AFF8EE521F875C5B5444084F4_terseLabel_en-US" xlink:label="lab_efoi_RestructuredOperatingLeaseRightOfUseAsset_2109C02AFF8EE521F875C5B5444084F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restructured lease, right-of-use asset </link:label>
<link:label id="lab_efoi_RestructuredOperatingLeaseRightOfUseAsset_2109C02AFF8EE521F875C5B5444084F4_label_en-US" xlink:label="lab_efoi_RestructuredOperatingLeaseRightOfUseAsset_2109C02AFF8EE521F875C5B5444084F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructured Operating Lease, Right-Of-Use Asset </link:label>
<link:label id="lab_efoi_RestructuredOperatingLeaseRightOfUseAsset_2109C02AFF8EE521F875C5B5444084F4_documentation_en-US" xlink:label="lab_efoi_RestructuredOperatingLeaseRightOfUseAsset_2109C02AFF8EE521F875C5B5444084F4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Restructured Operating Lease, Right-Of-Use Asset </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuredOperatingLeaseRightOfUseAsset" xlink:label="loc_efoi_RestructuredOperatingLeaseRightOfUseAsset_2109C02AFF8EE521F875C5B5444084F4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_RestructuredOperatingLeaseRightOfUseAsset_2109C02AFF8EE521F875C5B5444084F4" xlink:to="lab_efoi_RestructuredOperatingLeaseRightOfUseAsset_2109C02AFF8EE521F875C5B5444084F4" xlink:type="arc"/>
<link:label id="lab_efoi_OperatingLeaseRightofUseAssetIncludingRestructuredLeases_A40FCDA71D45CE1EF04EC5B544402E8C_totalLabel_en-US" xlink:label="lab_efoi_OperatingLeaseRightofUseAssetIncludingRestructuredLeases_A40FCDA71D45CE1EF04EC5B544402E8C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Operating lease right-of-use assets, total </link:label>
<link:label id="lab_efoi_OperatingLeaseRightofUseAssetIncludingRestructuredLeases_A40FCDA71D45CE1EF04EC5B544402E8C_label_en-US" xlink:label="lab_efoi_OperatingLeaseRightofUseAssetIncludingRestructuredLeases_A40FCDA71D45CE1EF04EC5B544402E8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Right-of-Use Asset, Including Restructured Leases </link:label>
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<link:label id="lab_efoi_FinanceLeaseRightOfUseAssetGross_76540B4347033879BB57C5B54440B04D_terseLabel_en-US" xlink:label="lab_efoi_FinanceLeaseRightOfUseAssetGross_76540B4347033879BB57C5B54440B04D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property and equipment </link:label>
<link:label id="lab_efoi_FinanceLeaseRightOfUseAssetGross_76540B4347033879BB57C5B54440B04D_label_en-US" xlink:label="lab_efoi_FinanceLeaseRightOfUseAssetGross_76540B4347033879BB57C5B54440B04D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Right-Of-Use Asset, Gross </link:label>
<link:label id="lab_efoi_FinanceLeaseRightOfUseAssetGross_76540B4347033879BB57C5B54440B04D_documentation_en-US" xlink:label="lab_efoi_FinanceLeaseRightOfUseAssetGross_76540B4347033879BB57C5B54440B04D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Finance Lease, Right-Of-Use Asset, Gross </link:label>
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<link:label id="lab_us-gaap_FinanceLeaseRightOfUseAsset_D73045D69249E322C80CC5B544413BFE_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseRightOfUseAsset_D73045D69249E322C80CC5B544413BFE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Right-of-Use Asset </link:label>
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<link:label id="lab_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_E212EF93EEB2165602F8C59C20B2AE1D_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_E212EF93EEB2165602F8C59C20B2AE1D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued expenses and other reserves </link:label>
<link:label id="lab_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_E212EF93EEB2165602F8C59C20B2AE1D_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_E212EF93EEB2165602F8C59C20B2AE1D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other </link:label>
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<link:label id="lab_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_AC8ECC27E2FDE75C878AC5A2599B64BF_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_AC8ECC27E2FDE75C878AC5A2599B64BF" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Right-of-use-asset </link:label>
<link:label id="lab_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_AC8ECC27E2FDE75C878AC5A2599B64BF_label_en-US" xlink:label="lab_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_AC8ECC27E2FDE75C878AC5A2599B64BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Tax Liabilities, Leasing Arrangements </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxLiabilitiesLeasingArrangements" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_AC8ECC27E2FDE75C878AC5A2599B64BF" xlink:type="locator"/>
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<link:label id="lab_efoi_DeferredTaxAssetsLeasingArrangements_A1F9FF1E30FCA7A9343EC5A3154EAFB9_terseLabel_en-US" xlink:label="lab_efoi_DeferredTaxAssetsLeasingArrangements_A1F9FF1E30FCA7A9343EC5A3154EAFB9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lease liabilities </link:label>
<link:label id="lab_efoi_DeferredTaxAssetsLeasingArrangements_A1F9FF1E30FCA7A9343EC5A3154EAFB9_label_en-US" xlink:label="lab_efoi_DeferredTaxAssetsLeasingArrangements_A1F9FF1E30FCA7A9343EC5A3154EAFB9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Tax Assets, Leasing Arrangements </link:label>
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<link:label id="lab_us-gaap_DeferredTaxAssetsLiabilitiesNet_AB55CCC468A0D03F564CC59C20B3FAEF_label_en-US" xlink:label="lab_us-gaap_DeferredTaxAssetsLiabilitiesNet_AB55CCC468A0D03F564CC59C20B3FAEF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Tax Assets, Net </link:label>
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<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_AB55CCC468A0D03F564CC59C20B3FAEF" xlink:to="lab_us-gaap_DeferredTaxAssetsLiabilitiesNet_AB55CCC468A0D03F564CC59C20B3FAEF" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_D598B96971D575D5D9CADE4039979340_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_D598B96971D575D5D9CADE4039979340" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Restructuring Reserve by Type of Cost </link:label>
<link:label id="lab_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_D598B96971D575D5D9CADE4039979340_label_en-US" xlink:label="lab_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_D598B96971D575D5D9CADE4039979340" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Restructuring Reserve by Type of Cost [Table Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock" xlink:label="loc_us-gaap_ScheduleOfRestructuringReserveByTypeOfCostTextBlock_D598B96971D575D5D9CADE4039979340" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncomeTaxDisclosureTextBlock_31341E4B753B6278CD9AC5462F491150_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureTextBlock_31341E4B753B6278CD9AC5462F491150" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income Taxes </link:label>
<link:label id="lab_us-gaap_IncomeTaxDisclosureTextBlock_31341E4B753B6278CD9AC5462F491150_label_en-US" xlink:label="lab_us-gaap_IncomeTaxDisclosureTextBlock_31341E4B753B6278CD9AC5462F491150" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Tax Disclosure [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxDisclosureTextBlock" xlink:label="loc_us-gaap_IncomeTaxDisclosureTextBlock_31341E4B753B6278CD9AC5462F491150" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AssetsAbstract_6B945D3DF8798B361E2707CE9D8C942D_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract_6B945D3DF8798B361E2707CE9D8C942D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> ASSETS </link:label>
<link:label id="lab_us-gaap_AssetsAbstract_6B945D3DF8798B361E2707CE9D8C942D_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract_6B945D3DF8798B361E2707CE9D8C942D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_6B945D3DF8798B361E2707CE9D8C942D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsAbstract_6B945D3DF8798B361E2707CE9D8C942D" xlink:to="lab_us-gaap_AssetsAbstract_6B945D3DF8798B361E2707CE9D8C942D" xlink:type="arc"/>
<link:label id="lab_us-gaap_AssetsCurrentAbstract_1CD04F615B00D1BA53DE07CE9D8C35BE_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_1CD04F615B00D1BA53DE07CE9D8C35BE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current assets: </link:label>
<link:label id="lab_us-gaap_AssetsCurrentAbstract_1CD04F615B00D1BA53DE07CE9D8C35BE_label_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_1CD04F615B00D1BA53DE07CE9D8C35BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets, Current [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_1CD04F615B00D1BA53DE07CE9D8C35BE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsCurrentAbstract_1CD04F615B00D1BA53DE07CE9D8C35BE" xlink:to="lab_us-gaap_AssetsCurrentAbstract_1CD04F615B00D1BA53DE07CE9D8C35BE" xlink:type="arc"/>
<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_E8E8D6C85A9EB39F010107CE9D8DD686_verboseLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_E8E8D6C85A9EB39F010107CE9D8DD686" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Cash </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_E8E8D6C85A9EB39F010107CE9D8DD686" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_E8E8D6C85A9EB39F010107CE9D8DD686" xlink:to="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_E8E8D6C85A9EB39F010107CE9D8DD686" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccountsReceivableNetCurrent_7F18180A7FBE85E3969707CE9D8D1C77_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_7F18180A7FBE85E3969707CE9D8D1C77" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Trade accounts receivable, less allowances of $28 and $33, respectively </link:label>
<link:label id="lab_us-gaap_AccountsReceivableNetCurrent_7F18180A7FBE85E3969707CE9D8D1C77_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_7F18180A7FBE85E3969707CE9D8D1C77" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, after Allowance for Credit Loss, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_7F18180A7FBE85E3969707CE9D8D1C77" xlink:type="locator"/>
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<link:label id="lab_us-gaap_InventoryNet_60FC3F8D651C8C5C2C7607CE9D8DE0BF_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_60FC3F8D651C8C5C2C7607CE9D8DE0BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Inventories, net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_60FC3F8D651C8C5C2C7607CE9D8DE0BF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryNet_60FC3F8D651C8C5C2C7607CE9D8DE0BF" xlink:to="lab_us-gaap_InventoryNet_60FC3F8D651C8C5C2C7607CE9D8DE0BF" xlink:type="arc"/>
<link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_4A0D738081D45B6DF3F607CE9D8D2741_terseLabel_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_4A0D738081D45B6DF3F607CE9D8D2741" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Prepaid and other current assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_4A0D738081D45B6DF3F607CE9D8D2741" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_4A0D738081D45B6DF3F607CE9D8D2741" xlink:to="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_4A0D738081D45B6DF3F607CE9D8D2741" xlink:type="arc"/>
<link:label id="lab_us-gaap_AssetsCurrent_090735D215416347B37607CE9D8D0B08_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_090735D215416347B37607CE9D8D0B08" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total current assets </link:label>
<link:label id="lab_us-gaap_AssetsCurrent_090735D215416347B37607CE9D8D0B08_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_090735D215416347B37607CE9D8D0B08" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_090735D215416347B37607CE9D8D0B08" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsCurrent_090735D215416347B37607CE9D8D0B08" xlink:to="lab_us-gaap_AssetsCurrent_090735D215416347B37607CE9D8D0B08" xlink:type="arc"/>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_CEC6FFCAF58BA3E24CAA07CE9D8DC78D_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_CEC6FFCAF58BA3E24CAA07CE9D8DC78D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property and equipment, net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_CEC6FFCAF58BA3E24CAA07CE9D8DC78D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherAssetsNoncurrent_3597083ACF12D3A1E95F07CE9D8D03AB_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_3597083ACF12D3A1E95F07CE9D8D03AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other assets </link:label>
<link:label id="lab_us-gaap_OtherAssetsNoncurrent_3597083ACF12D3A1E95F07CE9D8D03AB_label_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_3597083ACF12D3A1E95F07CE9D8D03AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Assets, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_3597083ACF12D3A1E95F07CE9D8D03AB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_Assets_7F272B97BE542715C32307CE9D8D2FF7_totalLabel_en-US" xlink:label="lab_us-gaap_Assets_7F272B97BE542715C32307CE9D8D2FF7" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total assets </link:label>
<link:label id="lab_us-gaap_Assets_7F272B97BE542715C32307CE9D8D2FF7_label_en-US" xlink:label="lab_us-gaap_Assets_7F272B97BE542715C32307CE9D8D2FF7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_7F272B97BE542715C32307CE9D8D2FF7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LiabilitiesAbstract_7C2CEB59EFE4554B627407CE9D8DFA67_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAbstract_7C2CEB59EFE4554B627407CE9D8DFA67" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> LIABILITIES </link:label>
<link:label id="lab_us-gaap_LiabilitiesAbstract_7C2CEB59EFE4554B627407CE9D8DFA67_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAbstract_7C2CEB59EFE4554B627407CE9D8DFA67" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities [Abstract] </link:label>
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<link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_5AAEC9D3A224E50D997207CE9D8D327D_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_5AAEC9D3A224E50D997207CE9D8D327D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current liabilities: </link:label>
<link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_5AAEC9D3A224E50D997207CE9D8D327D_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_5AAEC9D3A224E50D997207CE9D8D327D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Current [Abstract] </link:label>
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<link:label id="lab_us-gaap_AccountsPayableCurrent_FDB8DDD64C04E97EE48707CE9D8D5971_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_FDB8DDD64C04E97EE48707CE9D8D5971" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts payable </link:label>
<link:label id="lab_us-gaap_AccountsPayableCurrent_FDB8DDD64C04E97EE48707CE9D8D5971_label_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_FDB8DDD64C04E97EE48707CE9D8D5971" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Payable, Current </link:label>
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<link:label id="lab_us-gaap_DeferredRevenueCurrent_B91D9DF28040206D4B2007CE9D928226_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenueCurrent_B91D9DF28040206D4B2007CE9D928226" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred revenue </link:label>
<link:label id="lab_us-gaap_DeferredRevenueCurrent_B91D9DF28040206D4B2007CE9D928226_label_en-US" xlink:label="lab_us-gaap_DeferredRevenueCurrent_B91D9DF28040206D4B2007CE9D928226" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Revenue, Current </link:label>
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<link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_3BEDD838D26BABCCAD4F07CE9D921A68_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_3BEDD838D26BABCCAD4F07CE9D921A68" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating lease liabilities </link:label>
<link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_3BEDD838D26BABCCAD4F07CE9D921A68_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_3BEDD838D26BABCCAD4F07CE9D921A68" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Liability, Current </link:label>
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<link:label id="lab_efoi_RestructuredOperatingLeaseLiabilityCurrent_34D6BD183EC5C27752DD07CE9D9256BA_documentation_en-US" xlink:label="lab_efoi_RestructuredOperatingLeaseLiabilityCurrent_34D6BD183EC5C27752DD07CE9D9256BA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Restructured Operating Lease, Liability, Current </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuredOperatingLeaseLiabilityCurrent" xlink:label="loc_efoi_RestructuredOperatingLeaseLiabilityCurrent_34D6BD183EC5C27752DD07CE9D9256BA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FinanceLeaseLiabilityCurrent_805EA8D0AAD976784B6E07CE9D92B43A_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityCurrent_805EA8D0AAD976784B6E07CE9D92B43A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Finance lease liabilities, net of current portion </link:label>
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<link:label id="lab_us-gaap_ConvertibleNotesPayableCurrent_E3A7E3220C9A3B71199907CE9D92E3F2_terseLabel_en-US" xlink:label="lab_us-gaap_ConvertibleNotesPayableCurrent_E3A7E3220C9A3B71199907CE9D92E3F2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Convertible notes </link:label>
<link:label id="lab_us-gaap_ConvertibleNotesPayableCurrent_E3A7E3220C9A3B71199907CE9D92E3F2_label_en-US" xlink:label="lab_us-gaap_ConvertibleNotesPayableCurrent_E3A7E3220C9A3B71199907CE9D92E3F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Convertible Notes Payable, Current </link:label>
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<link:label id="lab_us-gaap_MediumtermNotesCurrent_FC6CAA2323EEF11A3C3807CE9D925E00_label_en-US" xlink:label="lab_us-gaap_MediumtermNotesCurrent_FC6CAA2323EEF11A3C3807CE9D925E00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Medium-term Notes, Current </link:label>
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<link:label id="lab_us-gaap_LiabilitiesCurrent_579259D0E08976ABF2AB07CE9D92E7F2_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_579259D0E08976ABF2AB07CE9D92E7F2" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total current liabilities </link:label>
<link:label id="lab_us-gaap_LiabilitiesCurrent_579259D0E08976ABF2AB07CE9D92E7F2_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_579259D0E08976ABF2AB07CE9D92E7F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Current </link:label>
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<link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_0B63C89B0A1D5D88294007CE9D9258C1_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_0B63C89B0A1D5D88294007CE9D9258C1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other liabilities </link:label>
<link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_0B63C89B0A1D5D88294007CE9D9258C1_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_0B63C89B0A1D5D88294007CE9D9258C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Liabilities, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_0B63C89B0A1D5D88294007CE9D9258C1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_597B0B691D7E6820553007CE9D92D647_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_597B0B691D7E6820553007CE9D92D647" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating lease liabilities, net of current portion </link:label>
<link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_597B0B691D7E6820553007CE9D92D647_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_597B0B691D7E6820553007CE9D92D647" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Liability, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_597B0B691D7E6820553007CE9D92D647" xlink:type="locator"/>
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<link:label id="lab_efoi_RestructuredOperatingLeaseLiabilityNoncurrent_182336E2E5537972A75307CE9D9242E0_terseLabel_en-US" xlink:label="lab_efoi_RestructuredOperatingLeaseLiabilityNoncurrent_182336E2E5537972A75307CE9D9242E0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restructured lease liabilities, net of current portion </link:label>
<link:label id="lab_efoi_RestructuredOperatingLeaseLiabilityNoncurrent_182336E2E5537972A75307CE9D9242E0_label_en-US" xlink:label="lab_efoi_RestructuredOperatingLeaseLiabilityNoncurrent_182336E2E5537972A75307CE9D9242E0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restructured Operating Lease, Liability, Noncurrent </link:label>
<link:label id="lab_efoi_RestructuredOperatingLeaseLiabilityNoncurrent_182336E2E5537972A75307CE9D9242E0_documentation_en-US" xlink:label="lab_efoi_RestructuredOperatingLeaseLiabilityNoncurrent_182336E2E5537972A75307CE9D9242E0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Restructured Operating Lease, Liability, Noncurrent </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_RestructuredOperatingLeaseLiabilityNoncurrent" xlink:label="loc_efoi_RestructuredOperatingLeaseLiabilityNoncurrent_182336E2E5537972A75307CE9D9242E0" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_6918C5B8C332B541FA2A07CE9D96CB81_terseLabel_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_6918C5B8C332B541FA2A07CE9D96CB81" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Finance lease liabilities </link:label>
<link:label id="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_6918C5B8C332B541FA2A07CE9D96CB81_label_en-US" xlink:label="lab_us-gaap_FinanceLeaseLiabilityNoncurrent_6918C5B8C332B541FA2A07CE9D96CB81" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finance Lease, Liability, Noncurrent </link:label>
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<link:label id="lab_us-gaap_MediumtermNotesNoncurrent_5844462F7F54C4567EE107CE9D962AFE_terseLabel_en-US" xlink:label="lab_us-gaap_MediumtermNotesNoncurrent_5844462F7F54C4567EE107CE9D962AFE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Iliad note, net of current maturities </link:label>
<link:label id="lab_us-gaap_MediumtermNotesNoncurrent_5844462F7F54C4567EE107CE9D962AFE_label_en-US" xlink:label="lab_us-gaap_MediumtermNotesNoncurrent_5844462F7F54C4567EE107CE9D962AFE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Medium-term Notes, Noncurrent </link:label>
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<link:label id="lab_us-gaap_Liabilities_CE4BAC42BD038C20924F07CE9D96CF30_totalLabel_en-US" xlink:label="lab_us-gaap_Liabilities_CE4BAC42BD038C20924F07CE9D96CF30" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total liabilities </link:label>
<link:label id="lab_us-gaap_Liabilities_CE4BAC42BD038C20924F07CE9D96CF30_label_en-US" xlink:label="lab_us-gaap_Liabilities_CE4BAC42BD038C20924F07CE9D96CF30" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_CE4BAC42BD038C20924F07CE9D96CF30" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockholdersEquityAbstract_664379F4DCEF4FF9CC4307CE9D960992_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_664379F4DCEF4FF9CC4307CE9D960992" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> STOCKHOLDERS’ EQUITY </link:label>
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<link:label id="lab_us-gaap_PreferredStockValue_0D2503E7E011B8C0714707CE9D9619B1_label_en-US" xlink:label="lab_us-gaap_PreferredStockValue_0D2503E7E011B8C0714707CE9D9619B1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Preferred Stock, Value, Issued </link:label>
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<link:label id="lab_us-gaap_AdditionalPaidInCapitalCommonStock_B9DACFC16BD8029305F507CE9D967112_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalCommonStock_B9DACFC16BD8029305F507CE9D967112" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Additional paid-in capital </link:label>
<link:label id="lab_us-gaap_AdditionalPaidInCapitalCommonStock_B9DACFC16BD8029305F507CE9D967112_label_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalCommonStock_B9DACFC16BD8029305F507CE9D967112" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Additional Paid in Capital, Common Stock </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_B9DACFC16BD8029305F507CE9D967112" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdditionalPaidInCapitalCommonStock_B9DACFC16BD8029305F507CE9D967112" xlink:to="lab_us-gaap_AdditionalPaidInCapitalCommonStock_B9DACFC16BD8029305F507CE9D967112" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_0C446FEFB2FD95FC9E1407CE9D966CA9_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_0C446FEFB2FD95FC9E1407CE9D966CA9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated other comprehensive loss </link:label>
<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_0C446FEFB2FD95FC9E1407CE9D966CA9_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_0C446FEFB2FD95FC9E1407CE9D966CA9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accumulated Other Comprehensive Income (Loss), Net of Tax </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_0C446FEFB2FD95FC9E1407CE9D966CA9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_0C446FEFB2FD95FC9E1407CE9D966CA9" xlink:to="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_0C446FEFB2FD95FC9E1407CE9D966CA9" xlink:type="arc"/>
<link:label id="lab_us-gaap_RetainedEarningsAccumulatedDeficit_0C85E8201DCC825F573F07CE9D961CEE_terseLabel_en-US" xlink:label="lab_us-gaap_RetainedEarningsAccumulatedDeficit_0C85E8201DCC825F573F07CE9D961CEE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accumulated deficit </link:label>
<link:label id="lab_us-gaap_RetainedEarningsAccumulatedDeficit_0C85E8201DCC825F573F07CE9D961CEE_label_en-US" xlink:label="lab_us-gaap_RetainedEarningsAccumulatedDeficit_0C85E8201DCC825F573F07CE9D961CEE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Retained Earnings (Accumulated Deficit) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_0C85E8201DCC825F573F07CE9D961CEE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RetainedEarningsAccumulatedDeficit_0C85E8201DCC825F573F07CE9D961CEE" xlink:to="lab_us-gaap_RetainedEarningsAccumulatedDeficit_0C85E8201DCC825F573F07CE9D961CEE" xlink:type="arc"/>
<link:label id="lab_us-gaap_StockholdersEquity_9F5F16798D5CD2AD53C807CE9D96AE55_totalLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_9F5F16798D5CD2AD53C807CE9D96AE55" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total stockholders' equity </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_9F5F16798D5CD2AD53C807CE9D96AE55" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquity_9F5F16798D5CD2AD53C807CE9D96AE55" xlink:to="lab_us-gaap_StockholdersEquity_9F5F16798D5CD2AD53C807CE9D96AE55" xlink:type="arc"/>
<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_895AA9209850E5C15F9907CE9D96A8DE_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity_895AA9209850E5C15F9907CE9D96A8DE" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total liabilities and stockholders' equity </link:label>
<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_895AA9209850E5C15F9907CE9D96A8DE_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity_895AA9209850E5C15F9907CE9D96A8DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities and Equity </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_895AA9209850E5C15F9907CE9D96A8DE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_895AA9209850E5C15F9907CE9D96A8DE" xlink:to="lab_us-gaap_LiabilitiesAndStockholdersEquity_895AA9209850E5C15F9907CE9D96A8DE" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_A1D0F0515DAFE6D50ECCC5462F78D771_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_A1D0F0515DAFE6D50ECCC5462F78D771" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Option, Exercise Price Range [Table] </link:label>
<link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_A1D0F0515DAFE6D50ECCC5462F78D771_label_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_A1D0F0515DAFE6D50ECCC5462F78D771" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Option, Exercise Price Range [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_A1D0F0515DAFE6D50ECCC5462F78D771" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_A1D0F0515DAFE6D50ECCC5462F78D771" xlink:to="lab_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_A1D0F0515DAFE6D50ECCC5462F78D771" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_FF7888792DF9D51C0B2AC5462F7E1CCA_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_FF7888792DF9D51C0B2AC5462F7E1CCA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Exercise Price Range [Axis] </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_FF7888792DF9D51C0B2AC5462F7E1CCA_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_FF7888792DF9D51C0B2AC5462F7E1CCA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Exercise Price Range [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_FF7888792DF9D51C0B2AC5462F7E1CCA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_FF7888792DF9D51C0B2AC5462F7E1CCA" xlink:to="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_FF7888792DF9D51C0B2AC5462F7E1CCA" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_67CD12E6D7EA1EC8D98FC5462F7E69F7_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_67CD12E6D7EA1EC8D98FC5462F7E69F7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Exercise Price Range [Domain] </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_67CD12E6D7EA1EC8D98FC5462F7E69F7_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_67CD12E6D7EA1EC8D98FC5462F7E69F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Exercise Price Range [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_67CD12E6D7EA1EC8D98FC5462F7E69F7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_67CD12E6D7EA1EC8D98FC5462F7E69F7" xlink:to="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_67CD12E6D7EA1EC8D98FC5462F7E69F7" xlink:type="arc"/>
<link:label id="lab_efoi_ExercisePriceRangeOneMember_EB23EB4C829316EDDF27C5462F7FD80B_terseLabel_en-US" xlink:label="lab_efoi_ExercisePriceRangeOneMember_EB23EB4C829316EDDF27C5462F7FD80B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Exercise price, range one </link:label>
<link:label id="lab_efoi_ExercisePriceRangeOneMember_EB23EB4C829316EDDF27C5462F7FD80B_label_en-US" xlink:label="lab_efoi_ExercisePriceRangeOneMember_EB23EB4C829316EDDF27C5462F7FD80B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Exercise Price Range One [Member] </link:label>
<link:label id="lab_efoi_ExercisePriceRangeOneMember_EB23EB4C829316EDDF27C5462F7FD80B_documentation_en-US" xlink:label="lab_efoi_ExercisePriceRangeOneMember_EB23EB4C829316EDDF27C5462F7FD80B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The first exercise price range. </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_ExercisePriceRangeOneMember" xlink:label="loc_efoi_ExercisePriceRangeOneMember_EB23EB4C829316EDDF27C5462F7FD80B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_ExercisePriceRangeOneMember_EB23EB4C829316EDDF27C5462F7FD80B" xlink:to="lab_efoi_ExercisePriceRangeOneMember_EB23EB4C829316EDDF27C5462F7FD80B" xlink:type="arc"/>
<link:label id="lab_efoi_ExercisePriceRangeTwoMember_0FC49CADA017FA98D164C5462F7F9029_terseLabel_en-US" xlink:label="lab_efoi_ExercisePriceRangeTwoMember_0FC49CADA017FA98D164C5462F7F9029" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Exercise price, range two </link:label>
<link:label id="lab_efoi_ExercisePriceRangeTwoMember_0FC49CADA017FA98D164C5462F7F9029_label_en-US" xlink:label="lab_efoi_ExercisePriceRangeTwoMember_0FC49CADA017FA98D164C5462F7F9029" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Exercise Price Range Two [Member] </link:label>
<link:label id="lab_efoi_ExercisePriceRangeTwoMember_0FC49CADA017FA98D164C5462F7F9029_documentation_en-US" xlink:label="lab_efoi_ExercisePriceRangeTwoMember_0FC49CADA017FA98D164C5462F7F9029" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The second exercise price range. </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_ExercisePriceRangeTwoMember" xlink:label="loc_efoi_ExercisePriceRangeTwoMember_0FC49CADA017FA98D164C5462F7F9029" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_ExercisePriceRangeTwoMember_0FC49CADA017FA98D164C5462F7F9029" xlink:to="lab_efoi_ExercisePriceRangeTwoMember_0FC49CADA017FA98D164C5462F7F9029" xlink:type="arc"/>
<link:label id="lab_efoi_ExercisePriceRangeThreeMember_7858BFAB71F78ED07390C5462F80B66B_terseLabel_en-US" xlink:label="lab_efoi_ExercisePriceRangeThreeMember_7858BFAB71F78ED07390C5462F80B66B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Exercise price, range three </link:label>
<link:label id="lab_efoi_ExercisePriceRangeThreeMember_7858BFAB71F78ED07390C5462F80B66B_label_en-US" xlink:label="lab_efoi_ExercisePriceRangeThreeMember_7858BFAB71F78ED07390C5462F80B66B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Exercise Price Range Three [Member] </link:label>
<link:label id="lab_efoi_ExercisePriceRangeThreeMember_7858BFAB71F78ED07390C5462F80B66B_documentation_en-US" xlink:label="lab_efoi_ExercisePriceRangeThreeMember_7858BFAB71F78ED07390C5462F80B66B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The third exercise price range. </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_ExercisePriceRangeThreeMember" xlink:label="loc_efoi_ExercisePriceRangeThreeMember_7858BFAB71F78ED07390C5462F80B66B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_ExercisePriceRangeThreeMember_7858BFAB71F78ED07390C5462F80B66B" xlink:to="lab_efoi_ExercisePriceRangeThreeMember_7858BFAB71F78ED07390C5462F80B66B" xlink:type="arc"/>
<link:label id="lab_efoi_ExercisePriceRangeFourMember_5B7AAC9FB8CBE991B1CAC5462F80D73F_terseLabel_en-US" xlink:label="lab_efoi_ExercisePriceRangeFourMember_5B7AAC9FB8CBE991B1CAC5462F80D73F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Exercise price, range four </link:label>
<link:label id="lab_efoi_ExercisePriceRangeFourMember_5B7AAC9FB8CBE991B1CAC5462F80D73F_label_en-US" xlink:label="lab_efoi_ExercisePriceRangeFourMember_5B7AAC9FB8CBE991B1CAC5462F80D73F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Exercise Price Range Four [Member] </link:label>
<link:label id="lab_efoi_ExercisePriceRangeFourMember_5B7AAC9FB8CBE991B1CAC5462F80D73F_documentation_en-US" xlink:label="lab_efoi_ExercisePriceRangeFourMember_5B7AAC9FB8CBE991B1CAC5462F80D73F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> The third exercise price range. </link:label>
<link:loc xlink:href="efoi-20191231.xsd#efoi_ExercisePriceRangeFourMember" xlink:label="loc_efoi_ExercisePriceRangeFourMember_5B7AAC9FB8CBE991B1CAC5462F80D73F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_efoi_ExercisePriceRangeFourMember_5B7AAC9FB8CBE991B1CAC5462F80D73F" xlink:to="lab_efoi_ExercisePriceRangeFourMember_5B7AAC9FB8CBE991B1CAC5462F80D73F" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_D35CE5BFAE53A924DDCEC5462F809CCD_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_D35CE5BFAE53A924DDCEC5462F809CCD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_D35CE5BFAE53A924DDCEC5462F809CCD_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_D35CE5BFAE53A924DDCEC5462F809CCD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_D35CE5BFAE53A924DDCEC5462F809CCD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_D35CE5BFAE53A924DDCEC5462F809CCD" xlink:to="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_D35CE5BFAE53A924DDCEC5462F809CCD" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_E3ABC8C5D1E84B98084DC5462F80884A_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_E3ABC8C5D1E84B98084DC5462F80884A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Range of Exercise Prices, lower limit (in dollars per share) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_E3ABC8C5D1E84B98084DC5462F80884A_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_E3ABC8C5D1E84B98084DC5462F80884A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_E3ABC8C5D1E84B98084DC5462F80884A" xlink:type="locator"/>
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20 Subsequent Filings that Reference this Filing

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11/10/22  Energy Focus, Inc./DE             10-Q        9/30/22   80:7.7M
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12/28/21  Energy Focus, Inc./DE             S-3                    4:218K
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11/12/21  Energy Focus, Inc./DE             10-Q        9/30/21   78:7.9M
 8/12/21  Energy Focus, Inc./DE             10-Q        6/30/21   77:7.6M
 5/13/21  Energy Focus, Inc./DE             10-Q        3/31/21   79:7.1M
 3/25/21  Energy Focus, Inc./DE             10-K       12/31/20  102:9.9M
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 8/13/20  Energy Focus, Inc./DE             10-Q        6/30/20   73:8.6M
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