Exhibit 99.1

AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13D

The undersigned hereby agree as follows:

(i) Each of them is individually eligible to use the Schedule 13D to which this Exhibit is attached, and such Schedule 13D is filed on behalf of each of them; and

(ii) Each of them is responsible for the timely filing of such Schedule 13D and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information is inaccurate.

Date: May 31, 2012

LED HOLDINGS, LLC
By:	/s/ Steven Wacaster
	Name: Steven Wacaster
	Title: Manager
PEGASUS CAPITAL ADVISORS, L.P.
By:	Pegasus Capital Advisors GP, L.L.C., its general partner
By:	/s/ Jason Schaefer
	Name: Jason Schaefer
	Title: General Counsel and Secretary
PEGASUS CAPITAL ADVISORS GP, L.L.C.
By:	/s/ Jason Schaefer
	Name: Jason Schaefer
	Title: General Counsel and Secretary
PP IV (AIV) LED, LLC
By:	Pegasus Partners IV (AIV), L.P.,
	its sole member

By:	Pegasus Investors IV, L.P.,
	its general partner

By:	Pegasus Investors IV GP, L.L.C.,
	general partner

By:	/s/ Jason Schaefer
	Name: Jason Schaefer
	Title: General Counsel and Secretary

PP IV LED, LLC
By:	Pegasus Partners, IV, L.P.,
	its sole member

By:	Pegasus Investors IV, L.P.,
	its general partner

By:	Pegasus Investors IV GP, L.L.C.,
	its general partner

By:	/s/ Jason Schaefer
	Name: Jason Schaefer
	Title: General Counsel and Secretary

PEGASUS PARTNERS IV, L.P.
By:	Pegasus Investors IV, L.P.
	its general partner
By:	Pegasus Investors IV GP, L.L.C.,
	its general partner
By:	/s/ Jason Schaefer
	Name: Jason Schaefer
	Title: General Counsel and Secretary
LSGC HOLDINGS LLC
By:	Pegasus Partners IV, L.P.,
	its managing member
By:	Pegasus Investors IV, L.P.,
	its general partner
By:	Pegasus Investors IV GP, L.L.C.,
	its general partner
By:	/s/ Jason Schaefer
	Name: Jason Schaefer
	Title: General Counsel and Secretary
LSGC HOLDINGS II LLC
By:	Pegasus Partners IV, L.P.,
	its sole member
By:	Pegasus Investors IV, L.P.,
	its general partner
By:	Pegasus Investors IV GP, L.L.C.,
	its general partner
By:	/s/ Jason Schaefer
	Name: Jason Schaefer
	Title: General Counsel and Secretary
PCA LSG HOLDINGS, LLC
By:	Pegasus Capital, LLC,
	its managing member
By:	/s/ Craig Cogut
	Name: Craig Cogut
	Title: President & Managing Member
PEGASUS INVESTORS IV, L.P.
By:	Pegasus Investors IV GP, L.L.C.,
	its general partner
By:	/s/ Jason Schaefer
	Name: Jason Schaefer
	Title: General Counsel and Secretary

PEGASUS INVESTORS IV GP, L.L.C.
By:	/s/ Jason Schaefer
	Name: Jason Schaefer
	Title: General Counsel and Secretary
PEGASUS CAPITAL, LLC
By:	/s/ Craig Cogut
	Name: Craig Cogut
	Title: President & Managing Member
	/s/ Craig Cogut
	CRAIG COGUT