[Save] Possible Bicycle Generator?

[George Mokray]

I finally bought one of those "forever flashlights," a device where 
you shake a magnet through a copper coil to charge a capacitor and 
light an LED.  30 seconds of shaking for 5 minutes of light.  Or so 
they say on the box.  It works, sort of, but is not the brightest 
light I've seen in a flashlight.

However, what if you hooked one up to a bicycle wheel?  A bicycle 
electricity generator with less drag than wheel rim or hub generators?