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Exhibit 10.2

September 11, 2013

Portman Limited

Silver Tower

Corniche Road

P.O. Box 61999

Abu Dhabi, United Arab Emirates

Ladies and Gentlemen:

This Amendment No. 1 (this “Amendment”) is made to that certain Preferred Stock Subscription Agreement (the “Subscription Agreement”), dated as of September 25, 2012, by and between Lighting Science Group Corporation (the “Company”) and Portman Limited (“Portman”). This Amendment shall be effective with respect to Portman upon execution by the Company and Portman and the filing of the Restated Certificates of Designation (as defined below) with the Secretary of State of the State of Delaware (the later to occur of such events, the “Amendment Effective Date”).

The undersigned acknowledges that upon receipt of the requisite approval from the holders of the shares of Series H Convertible Preferred Stock and Series I Convertible Preferred Stock, respectively, the Company shall take all actions necessary to amend and restate the Series H Certificate of Designation, which amendment shall be substantially in the form attached hereto as Exhibit A (the “Restated Series H Certificate of Designation”), and to amend and restate the Series I Certificate of Designation, which amendment shall be substantially in the form attached hereto as Exhibit B (the “Restated Series I Certificate of Designation” and, together with the Restated Series H Certificate of Designation, collectively, the “Restated Certificates of Destination”).

In consideration of the premises and covenants set forth herein and other good and valuable consideration, including without limitation the amendments to be effected by the Restated Certificates of Designation, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows:

“Amendment Effective Date” shall have the meaning set forth in Amendment No. 1 to this Agreement dated September 11, 2013.

“NOTWITHSTANDING ANYTHING TO THE CONTRARY HEREIN, PURCHASER HEREBY WAIVES ON BEHALF OF ITSELF, ITS

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SUCCESSORS AND ITS ASSIGNS, ANY RIGHT TO BRING ANY ACTION, SUIT, PROCEEDING OR CLAIM FOR ANY LOSS RELATED TO OR ARISING FROM ANY PAST, PRESENT OR FUTURE BREACH OF THE REPRESENTATIONS AND WARRANTIES OF THE COMPANY SET FORTH IN THIS AGREEMENT, WITH THE EXCEPTION OF THE REPRESENTATIONS AND WARRANTIES SET FORTH IN SECTIONS 2(a) (ORGANIZATION), 2(b) (POWER), 2(c) (SUBSIDIARIES), 2(d)(i) (AUTHORIZATION), 2(e) (CAPITAL), 2(g) (CAPITALIZATION), 2(r) (TAX MATTERS) AND 2(t) (INTELLECTUAL PROPERTY) OF THIS AGREEMENT, OR WITH RESPECT TO ANY EXCLUDED LIABILITY.”

“(c) Survival. The representations and warranties of the parties set forth in this Agreement and the other Transaction Documents shall survive for a period beginning on September 25, 2012 and ending on the Amendment Effective Date and thereafter shall be of no further force or effect; provided, that the representations and warranties set forth in Sections 2(r) (Tax Matters) and 2(t) (Intellectual Property) shall survive for the applicable period of the statute of limitations and the representations and warranties set forth in Sections 2(a) (Organization), 2(b) (Power), 2(c) (Subsidiaries), 2(d)(i) (Authorization), 2(e) (Capital), and 2(g) (Capitalization) shall survive indefinitely (or if indefinite survival is not permitted by Law, then for the maximum period permitted by applicable Law). Following the expiration of the periods set forth above with respect to any particular representation or warranty, no party hereto shall have any further liability with respect to such representation or warranty. Except as set forth herein, all of the covenants, agreements and obligations of the parties hereto shall survive the Closing indefinitely (or if indefinite survival is not permitted by Law, then for the maximum period permitted by applicable Law). A claim for indemnification related to a breach of any of the representations and warranties becomes barred if not filed or noticed during the survival period; and the parties hereto intend to shorten (in the case of limited survival provisions) the applicable statute of limitations. Anything herein to the contrary notwithstanding, any claim for indemnification that is asserted by written notice within the survival period shall survive until resolved pursuant to a final non-appealable judicial determination or a written agreement between the Company and the applicable Purchaser(s) who has made such indemnification claim.”

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IN WITNESS WHEREOF, the parties hereto have executed this Amendment to be effective as of the Amendment Effective Date.

Signature Page to Amendment No. 1 to

Preferred Stock Subscription Agreement

Signature Page to Amendment No. 1 to

Preferred Stock Subscription Agreement