I know it doesn't have enough oomph to power a traditional headlight without burning up in short order, but I have a few Surefire tactical flashlights that are pretty dang bright. They can run off of a pair of CR123 batteries (3 volt) for a few hours. I have an LED mini scout light on one of my rifles and it is especially bright. It will run for 1.3 hours on a set of CR123. A single CR123 battery will last about 30 minutes at 2 amps. So let's say worst case, the LED is drawing 2 amps at 3 volts, that's 6 watts per LED. How much, if any, extra power is available form the stator on a YZ250F? I've seen a few after market stators that are supposed to provide 35-45w, that would be more than plenty to power a couple LEDs.