I stumbled on this while surfing for some camping equipment, and thought I should pass it along. Chemical lights have been around for years, and I'm sure more than a few people have them in thier BOBs, or their cars' glovebox.

http://www.hdssystems.com/ChemicalLights.htm

I have a bunch of chemical lights stashed in various places. Although they don't usually get bumped around, I did pull one out to see if it worked. It did, for the rated 6 hours (as noted on the package), but once the time was up, it went in the garbage. They are a great backup-backup I suppose. I don't think I'll take any with me camping though.

Just something to think about.