600 lumens for 4 hours; no electricity or batteries required

[kilgor]

http://bayourenaissanceman.blogspot.com/2008/02/this-is-potentially-huge.html

 

[X Racer]

Wow, interesting idea...

 

[jugg2]

Already being discussed in this thread.

 

[DM51]

As jugg2 points out, this is already being discussed elsewhere, so please use the link he has given. I'll close this one.