Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

This is the converter I have used, you can solder your generator right to the inputs, and then adjust the output voltage with the little brass screw on the blue box on top. This will pass as much as 15 watts, so more than enough to light a loooot of LED's. Cool feature of this is that you can have it output as low as 1.25V, so you can dim your LEDs as well.  https://a.co/d/feT7mfR