Need a rectifier for a standlight capacitor. Thus a complete new wiring of the lighting system rather than just a bulb replacement.

On the good side, there are lots of retrofit ideas in the electronics and lighting forum if you're kinda DIY handy...

Oops- RHM beat me to it... But there are a lot of good ideas in the lighting forum. I'm going to put together a 3-watt LED dynamo system with a standby battery and a regulated supply using a CREE bulb- it should be wicked bright, and it will fit into a vintage housing... but I gotta finish building the wheels first...