I am trying to keep my older Peugeot 103 (1974) mostly stock and this mod can be easily reversed. The LEDs need 12VDC (no battery necessary) and I don't want to alter the extremely simple wiring or swap out the headlight assembly, but the lights are really too dim to be safe. I have found some e10 base, 6000K, 360 lumen bulbs that should work as a headlight bulb, and a smaller 100 lumen version for the tail light. I'll update as the experiment proceeds.
(The Philips LED MR16 cost about $4.50 USD.)