I have one of these lights from OpticsPlanet http://www.opticsplanet.net/nc-star-aqptf-led-flashlight-for-pistols-rifles.html Sells for $35 free shipping, 1 Watt LED. Uses a CR123 Li-ion battery that will give you around 4 hours, you can buy extra batteries on the internet for less than a buck. It's very well made rugged construction. There's reviews on the web for additional info. Considering these lights go into the hundreds of dollars, this light is a steel.