Cyalume Technologies (CYLU) 10-Q 2008 Q1 Quarterly report

Exhibit 32.1

Certification
Pursuant to 18 U.S.C. Section 1350

Pursuant to U.S.C. Section 1350 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code), each of the undersigned officers of Vector Intersect Security Acquisition Corp. (the ‘‘Company’’), does hereby certify, to such officer’s knowledge, that:

The Quarterly Report on Form 10-Q for the quarter ended March 31, 2008 of the Company fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 20, 2008

			/s/ Yaron Eitan
			Name:  Yaron Eitan
			Title:      Chief Executive Officer                (Principal Executive, Accounting and                Financial officer)