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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 K683bHsERePzm86D9vxTJDVA9icgoM6WA4Ge0LjUws8y6B4mbGOmTqyz3Cn5RhI+
 RcmudRIBH0I+7q90Kp0Luw==

<SEC-DOCUMENT>0000902664-07-001600.txt : 20070502
<SEC-HEADER>0000902664-07-001600.hdr.sgml : 20070502
<ACCEPTANCE-DATETIME>20070502195935
ACCESSION NUMBER:		0000902664-07-001600
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20070413
FILED AS OF DATE:		20070502
DATE AS OF CHANGE:		20070502

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LIGHTING SCIENCE GROUP CORP
		CENTRAL INDEX KEY:			0000866970
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC LIGHTING & WIRING EQUIPMENT [3640]
		IRS NUMBER:				232596710
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2100 MCKINNEY AVENUE
		STREET 2:		SUITE 1555
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75201
		BUSINESS PHONE:		2143823630

	MAIL ADDRESS:	
		STREET 1:		2100 MCKINNEY AVENUE
		STREET 2:		SUITE 1555
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75201

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PHOENIX GROUP CORP
		DATE OF NAME CHANGE:	20001130

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PHOENIX HEATHCARE CORP
		DATE OF NAME CHANGE:	19990519

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	IATROS HEALTH NETWORK INC
		DATE OF NAME CHANGE:	19941221

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ARDSLEY ADVISORY PARTNERS
		CENTRAL INDEX KEY:			0000900529
		STATE OF INCORPORATION:			CT
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-20354
		FILM NUMBER:		07812539

	BUSINESS ADDRESS:	
		STREET 1:		262 HARBOR DRIVE, 4TH FLOOR
		CITY:			STAMFORD
		STATE:			CT
		ZIP:			06902
		BUSINESS PHONE:		203-564-4230

	MAIL ADDRESS:	
		STREET 1:		262 HARBOR DRIVE, 4TH FLOOR
		CITY:			STAMFORD
		STATE:			CT
		ZIP:			06902
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form4_ex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-04-13</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000866970</issuerCik>
        <issuerName>LIGHTING SCIENCE GROUP CORP</issuerName>
        <issuerTradingSymbol>LSGP.OB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000900529</rptOwnerCik>
            <rptOwnerName>ARDSLEY ADVISORY PARTNERS</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>262 HARBOR DRIVE, 4TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>STAMFORD</rptOwnerCity>
            <rptOwnerState>CT</rptOwnerState>
            <rptOwnerZipCode>06902</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $0.001</value>
            </securityTitle>
            <transactionDate>
                <value>2007-04-13</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>50000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.271</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                    <footnoteId id="F3"/>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11716665</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $0.001</value>
            </securityTitle>
            <transactionDate>
                <value>2007-04-17</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>25000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.2924</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                    <footnoteId id="F3"/>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11741665</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $0.001</value>
            </securityTitle>
            <transactionDate>
                <value>2007-04-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>50000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.2992</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                    <footnoteId id="F3"/>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11791665</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Ardsley Renewable Energy Offshore Fund, Ltd., a British Virgin Islands corporation (&quot;Ardsley Offshore&quot;) directly holds
 246,662 shares of Common Stock and immediately exercisable warrants for an additional 304,155 shares of Common Stock.
 Ardsley Partners Renewable Energy Fund, L.P., a Delaware limited partnership (&quot;Ardsley Domestic&quot;) located at c/o Ardsley
 Partners I, 262 Harbor Drive, Stamford, Connecticut 06902, directly holds 3,211,671 shares of Common Stock and immediately
 exercisable warrants for an additional 8,029,177 shares of Common Stock.</footnote>
        <footnote id="F2">Ardsley Advisory Partners, a New York general partnership (&quot;Ardsley&quot;) serves as investment manager to, and has investment
 discretion over the securities held by Ardsley Offshore, and serves as investment adviser to Ardsley Domestic.  Phillip J.
 Hempleman and Ardsley Partners I, a New York general partnership (&quot;Ardsley Partners&quot;) serve as the general partners of
 Ardsley Domestic.  Ardsley Partners also serves as the general partner of Ardsley.  Philip J. Hempleman, Ardsley and Ardsley
 Partners each disclaim any beneficial ownership of any of the Issuer's securities to which this Form 4 relates for the
 purposes of Section 16 of the Securities Exchange Act of 1934, as amended, except as to such securities in which each such
 person may be deemed to have an indirect pecuniary interest pursuant to Rule 16a-1(a)(2).</footnote>
        <footnote id="F3">Common Stock purchased by Ardsley Offshore.</footnote>
    </footnotes>

    <remarks>* Evidence of Power of Attorney was submitted with the Schedule 13G filed by Ardsley Advisory Partners on February 14, 2006
 and is incorporated by reference herein.</remarks>

    <ownerSignature>
        <signatureName>ARDSLEY PARTNERS RENEWABLE ENERGY FUND, L.P., BY: ARDSLEY PARTNERS I, GENERAL PARTNER, BY: /s/ Steve Napoli,* General Partner</signatureName>
        <signatureDate>2007-05-02</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>ARDSLEY RENEWABLE ENERGY OFFSHORE FUND, LTD., BY: /s/ Steve Napoli, Director</signatureName>
        <signatureDate>2007-05-02</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>ARDSLEY ADVISORY PARTNERS, BY: ARDSLEY PARTNERS I, GENERAL PARTNER, BY: /s/ Steve Napoli,* General Partner</signatureName>
        <signatureDate>2007-05-02</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>ARDSLEY PARTNERS I, BY PHILIP J. HEMPLEMEN, GENERAL PARTNER, BY: /s/ Steve Napoli,* General Partner</signatureName>
        <signatureDate>2007-05-02</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>PHILIP J. HEMPLEMAN, INDIVIDUALLY, BY: Steve Napoli,* As attorney in fact for Philip J. Hempleman</signatureName>
        <signatureDate>2007-05-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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