Jeff Quinn of Gunblast.com reviewed CMR-202 Universal Rail Mount Tactical Light. It emits 100 lumens and comes with 3 modes(constant, momentary, and strobe). It supposedly runs 4 hours. You'd need a screw driver to install it. It will be available 8/1. He also posted a video too.
From:
http://www.gunblast.com/CrimsonTrace-CMR202.htm
American Rifleman
reviewed LTG-760. It also emits 100 lumens, and runs on single CR2 lithium battery for two hours.
Price: $149 (Glock, Springfield, and Smith & Wesson), $199(1911)