Originally Posted by
yankeefan
Can I power both a headlight and a taillight with just a front hub. or will I need a rear hub as well? I remember reading somewhere that people use it to charge their cellphones, is that true?
With modern LED head and tail lights you can easily power a pair of headlights and at least one tail light - I'm running (and have for almost 4 years) two B&M IQ Fly headlights and a B&M Seculite tail powered with a single Shimano 3N71 dynohub on the front wheel. I don't feel the difference when riding when switching between one and two headlights. (I don't even feel a difference when riding with the lights off or the lights on)
I did try adding a second halogen headlight alongside a LED headlight and I really could feel the drag when riding.