Re: Gidday from Hanoi Vietnam
I've used both 6V and 12V generators which run by friction against the tire. You know the kind; they've been around for years. Generally I've had good luck with them, but had at least one burn up on me. They do tend to blow incandescent bulbs as they produce more voltage at speeds higher than ever anticipated for a bicycle generator. That was a problem until I switched over to LED lamps which are more tolerant of a wider band of voltage. Good luck and welcome to the forum.
Someday when I grow up I will probably lose interest in toys with wheels, but until then...