I don't have one, but I've saw a display. It has both red and blue LEDs, the combination is supposed to make the blood stand out. (blue makes it pop but as a black, red to thenhighlight it ????)

I guess the pricipal it supposed to be like "CSI" luminal but without the spray. (of course, if it worked that well, you'd see CSIs using it)

Who knows, maybe it would help. I can't see a company like GERBER selling a product with no testing or performance. Though that doesn't mean it works great, just that it works (to a point, in the right conditions, etc, etc)