I am running a NiteRider MiNewt 600 Cordless as my helmet light. Bright. I use it on the bike, and then at work doing golf course maintenance. We start before daylight and this light gives me loads of light to do setup (empty trash cans, refill water coolers, pick up the trash from the restaurant, change pin positions, etc., etc.). I have never felt I needed to use this light on a setting brighter than low; and while I've never actually timed the run time; the published run time may be a little liberal, but the actual run time seems to me to be very good. In fact the brightness and run time are excellent-outstanding when compared to some 4 AA lights I've owned. In use I run the battery down until the light goes into "reserve mode", and then charge it using the supplied wall outlet charger. I have never tried to charge this light using a USB port, and am probably not going to since the wall outlet charger works so well.

My handlebar mounted headlight is my old Cateye HL-EL530. Bright for a 4 AA. Run time, of course, depends on what batteries are used, but this light seems to have a very low power draw for the brightness. The bright spot of this light seems very small to me; and at one time, after I had been using this light for years, I did start running into a problem with the magnetic switch sticking. But a couple of light raps on a hard surface fixed that for me. I am currently trying lithium batteries in this light to see if I get a significantly longer run time over my old rechargeable AAs I was using, but I may go back to some new, more powerful, rechargeable AAs.