So I just got my new TLR-1 with the new C4 LED. It's rated at 135 lumens. This thing is great. My TK-10 is rated at 225 on turbo mode. The TLR-1 is at least as bright. Now, I know that the TK-10 is overrated on its output, but I'm just amazed that the new TLR-1 is so bright. It's also about an inch and a half shorter, and it weighs half of what my TK-10 and scope ring combo weigh. I'm gonna test the throw tonight when it gets dark outside. If it throws like the TK-10 then I'm gonna order another one and replace the TK-10 on my AR with the TLR-1. EDIT: And the TLR is rated at 2.5 hours runtime, the TK is only rated at 1.5 hours in turbo mode.