For inside use, 500 lumens from an X300 Ultra is overkill IMO. On light colored walls, you will get a lot more reflected light, which can adversely affect the shooters night vision. Outside is a different story however. The X300 is 170 lumens and slightly smaller. The TLR 1 seems a better value given it's lower cost if you are not in a combat situation but doing night stand duty. As mentioned, look at Insight Tech lights as well. Good quality, reasonable price. I have an Insight M6X light/laser combo on my G29SF and it's a good piece of gear. I have an X300 on another Glock 20SF with Crimson Trace LG's..
I've attached a comparison of the Surefire lights.
Last edited by swinokur; 11-17-2012 at 03:41..