Cyalume Technologies (CYLU) S-1/A IPO registration (amended)

                                                                    Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


To the Board of Directors
Vector Intersect Security Acquisition Corp.

We hereby consent to the use in this Amendment No. 3 to the Registration
Statement on Form S-1 of our report dated May 24, 2006, (except for footnote 7
as to which the date is June 7, 2006) on the financial statements of Vector
Intersect Security Acquisition Corp. (a corporation in the development stage) as
of December 31, 2005 and April 30, 2006 and for the period from July 19, 2005
(inception) to December 31, 2005 and for the four months ended April 30, 2006
and for the period from July 19, 2005 (inception) to April 30, 2006 which
appears in such Registration Statement. We also consent to the reference to our
Firm under the caption "Experts" in such Registration Statement.


/s/ Goldstein Golub Kessler LLP

GOLDSTEIN GOLUB KESSLER LLP
New York, New York
July 31, 2006