Originally Posted by ComPH

Not exactly on the topic, but there is something with enormous appeal. Did you guys hear of the Magnic Lite? It is a Eddy current generator that generates power for light. I don't think it generates a lot of power, but it could slow down discharge rates, or slowly charge caps/batteries. It doesn't touch the wheel at any point, so the effort would be negligible. The rim has to be metallic, but doesn't need to be ferric (aluminum is fine). More on this here: http://www.magniclight.com/magniclight/index.php/en/ .