Yeah, what Destecado said!
However, I think that if your helmet's faceplate has infra-red/night vision built into it you won't need a searchlight to GIVE YOUR POSITION AWAY in combat.
While it's an interesting touch, it's also utterly silly. Torches on your rifle is bad enough, but if you can just wear infrared or NVG's then there's no need for the torch. IMO.