Need help finding information on a tactical light?

I have recently aquired a tactical light for my AR. I can't find any inormation on it. It is a Surefire light, and what looks like it could be the model number is A410541. It looks almost identical to the M951XM07, but it has an infrared filter. I know it was issued to a soldier and was on his M4 in Afghanistan, but I can find any information as to it's approximate value or lumens.