Originally Posted by
LuckySailor
I have a Schmidt Dyno, and the Luxos U Headlight and tail light. The USB charger I thought was going to be a great bonus. Aaaaaahhhhh, kinda luke warm. It keeps the iPhone 5S charged, but haven't actually charged it to 100% or even close. I run usually an app (Cyclemeter or Ride with GPS), music, and a bluetooth speaker. So a fairly large demand on the charger. the other thing is, when you're under 12 mph, there is no charging going on. I'm running off the internal battery of the headlight, until I'm back over 12 mph. With all those electronics, I would consider a solar pack to strap onto your rear rack. At least then you're charging every minute-moving or stopped, even when it's cloudy you will still get something.
This is what I am finding out too, the USB charging is not great, maybe I should say its poor. But I do like the lamp, the main reason I bought it. USB was sort a bonus but not a great one on the touring bike where the speed is not always high enough to charge adequately.