The regular G2 Nitrolon comes in OD Green, Desert Tan, Safety Yellow or Black. Polymer, lightweight, indestructable and CHEAP! About $34 from midwayusa.com or the Surefire website. Midway has ultra-fast shipping, but you can get the 15-pack of lights from the Surefire website for 15 bucks.
The G2 Nitrolon has 60 lumens of power, whick is plenty bright for anything I'd ever use it for. It's bright enough to light a room and is too bright to look at without pain/blindness. It runs for about an hour continuously on one set of batteries. If you want, you can spend 15 bucks on Surefire's website and get the upgrade lamp assembly for double the power, but with only 1/3 the runtime. I have no clue what you'd need 120 lumens for, but whatever floats your boat.
The G2 Nitrolon is hands-down the best value in tac lights available.