<SEC-DOCUMENT>0000924168-16-000063.txt : 20160816
<SEC-HEADER>0000924168-16-000063.hdr.sgml : 20160816
<ACCEPTANCE-DATETIME>20160816170513
ACCESSION NUMBER:		0000924168-16-000063
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20160816
FILED AS OF DATE:		20160816
DATE AS OF CHANGE:		20160816

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ENERGY FOCUS, INC/DE
		CENTRAL INDEX KEY:			0000924168
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC LIGHTING & WIRING EQUIPMENT [3640]
		IRS NUMBER:				943021850
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		32000 AURORA ROAD
		STREET 2:		SUITE B
		CITY:			SOLON
		STATE:			OH
		ZIP:			44139
		BUSINESS PHONE:		4407151300

	MAIL ADDRESS:	
		STREET 1:		32000 AURORA ROAD
		STREET 2:		SUITE B
		CITY:			SOLON
		STATE:			OH
		ZIP:			44139

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FIBERSTARS INC /CA/
		DATE OF NAME CHANGE:	19940527

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Port Michael Harry
		CENTRAL INDEX KEY:			0001682287

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36583
		FILM NUMBER:		161836694

	MAIL ADDRESS:	
		STREET 1:		32000 AURORA ROAD
		STREET 2:		SUITE B
		CITY:			SOLON
		STATE:			OH
		ZIP:			44139
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>wf-form3_147138150000419.xml
<DESCRIPTION>FORM 3
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2016-08-16</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000924168</issuerCik>
        <issuerName>ENERGY FOCUS, INC/DE</issuerName>
        <issuerTradingSymbol>EFOI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001682287</rptOwnerCik>
            <rptOwnerName>Port Michael Harry</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>32000 AURORA ROAD</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE B</rptOwnerStreet2>
            <rptOwnerCity>SOLON</rptOwnerCity>
            <rptOwnerState>OH</rptOwnerState>
            <rptOwnerZipCode>44139</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Interim CFO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>609</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Option</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>15.08</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2016-07-13</value>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2025-09-17</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>5000.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F3"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2017-03-16</value>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2019-03-16</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3520.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Date applies to one-third of the total. The remaining two-thirds vest in equal monthly installments thereafter over a two year period.</footnote>
        <footnote id="F2">Date applies to one-third of the total. Another one-third vests two years from the grant date and the final one-third vests three years from the grant date.</footnote>
        <footnote id="F3">Each Restricted Stock Unit represents a contingent right to receive one share of Energy Focus, Inc. Common Stock.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Michael H. Port</signatureName>
        <signatureDate>2016-08-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
