Originally Posted by Stadjer

If you want it dyno powered you've got to make it dyno powered. I've had too many bottle dynamo's not to love battery fed led's, I would put the original inside parts in a box for future generations, and keep the outside original with batteries and leds on the inside, and keep the light yellow if I could. But that's just me, preserving the original does not necessarily mean using it as it was originally, I only make changes that are reversible but changing as little as possible is a nice ambition.