Think outside of the box (computer)

I dont have a USB bike light, but I see the appeal. I charge my phone and my ipad with a USB charger (different cables thanks to Apple not following the standard EVERY other manufacturer has adopted) - they are already at my desk. I dont want to deal with new proprietary chargers for every electronic thing I get. I rarely plug anything into a computer, but I may use the charger that came with my Garmin, or the one that came with my wife's phone, or the one that came with my old phone that got wet and ruined, or maybe even the one that came with my phone If I had a light, I know I have chagers at work, at home, and even in the car already that will work.