A white 5mm LED. I think it's 2000mcd, it came out of my junk box.
A red 3mm LED - high brightness. Optional. Lights when the capacitor is being charged by the dynamo.
A 1 Farad, 5.5 Volt capacitor.
A hand held crank dynamo. I got it at Jaycar electronics. I think the motor/gearbox from a simple toy car would probably work just as well.
It puts out about 5 Volts at top speed, so I thought it was a good idea to use a comparable capacitor.
Lots of patience. And coffee. And ciggies.
The switch stops the capacitor from discharging straight into the white LED, that would make it a hand-cranked light, and not a wind up, to use hands free, torch.