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| <xs:element id="efoi_InventoryReserveRollForward" abstract="true" name="InventoryReserveRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/> |
| <xs:element id="efoi_ToolingMember" abstract="false" name="ToolingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="efoi_RestructuredLeaseOperatingLeaseCost" abstract="false" name="RestructuredLeaseOperatingLeaseCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="efoi_EarningsPerShareBasicAndDilutedEPSAbstract" abstract="true" name="EarningsPerShareBasicAndDilutedEPSAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/> |
| <xs:element id="efoi_EstimatedProceedsFromIssuanceOfWarrants" abstract="false" name="EstimatedProceedsFromIssuanceOfWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="efoi_PayrollTaxCreditEmployeeRetentionCreditUnderTheCARESActCurrent" abstract="false" name="PayrollTaxCreditEmployeeRetentionCreditUnderTheCARESActCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="efoi_A2021StreetervilleNoteMember" abstract="true" name="A2021StreetervilleNoteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| </xs:schema> |