Originally Posted by
acidfast7
Most proper e-bikes (Pedelec in German - Pedal Electric) run the motor from the bottom bracket and can add zero through max assist, thus having the dynamo power the light makes sense (so the battery won't drain). In addition, German StVZO requires that the lights stay on for a set duration even when not moving, so German lights can illuminate for a set period without energy for the dynamo, therefore, adding wires to the lights makes no sense (it adds a point of failure) while not offering anything extra.
There are two points of yours I'm not following.
First of all, conversions of any kind have losses, so converting electric energy (battery) to kinetic energy and back (to the headlight) seems needlessly lossy even if the loss isn't great.
Secondly, you need a wire to the light, either from the dynamo or the battery, so what are you saying about adding wires?
The standlight function is normally in the light, so that seems like a non-issue. I have dynamo powered lights, and I do like the standlight function.