I picked up one of the newer Chinese lights from Costco, the first time I tried it at night as a test it hurt my eyes going from pitch black to really bright, not reflecting just really bright, I figured that in an emergency i'd be fighting trying to see while blinding the bad guy. Someone suggested that I shoot the beam at the ceiling first that way my eyes have a moment to adjust as I scan the room before dropping the beam on the trouble spot, tried it that way again and found that it works a lot better for me, my eyes didn't hurt and I was able to drop the beam with no problem, now this was with a hand held light, never been a fan of weapon mounted light at home.