Just have a look, this is real and no joke no tricks. It's dynamo and work similar to your electric power consumption meter from LIPA! Just inverse close to your rim via eddy current... support if you like and get one!

http://www.kickstarter.com/projects/dynamodirk/magnic-light-get-new-energy

http://www.magniclight.com/MagnicLight

I am supporting it already!
-Percy