I made this little light by cheating and using a modified circuit board from one of those LED solar garden lights. This one has a mystery smd chip under a gray blob and an inductor...that's it. Very simple and small and very bright. It will run down to .6 volts and draws less than 8 mA's. Sorry for the blurry close-up attempts...my camera sucks. More info at Overunitydotcom in the Joule Thief topic area. Thanks for watching.