So an electric bike whether violate local law?

An electric bike with taillight and headlight that provided power not by battery but by moto mill. In other words, if the electric bike is running, the taillight and headlight will light. if the electric bike stop, they will be turn off. I want to know this device whether violate local law? After google a long time, but I can't find anything about that content.you'd batter give me a address about the content,thank you for replying.