Originally Posted by
degnaw
My single ~160lumen helmet flashlight might make me a bit biased, but I think 180lumens are more than enough - all I have to do approaching intersections is momentarily aim the hotspot in the driver's window and they see me every time. Given the budget I would probably buy a P7, but that's more of a nice-to-have than a "minimum".
The point I was making is that you shouldn't have to aim the light to be noticed. And it's the drivers that you forget to aim your light at that will get you

I can do the same thing but seldom have too. Mine are so bright that I'm confused for a car running only one head light. It takes a particularly brain dead driver not to notice me
I've run LEDs with 180 lumen output and have had too many motorists pull out in front of me. The lack of illumination (it's getting better) and the restricted directionality are the reasons I don't use LED.