this reminds me of a mod i did to a 2-dollar twistie AA light some time ago. >> The Ultimate "Budget" EDC light, for LESS than 2 bucks. **UPDATE with MOD INFO**
I did an experiment with one after, by adding a resistor to to the boost driver get it to a low of roughly 4 –5 lumens with the a W/W version of the Luxeons i swapped in them, and it would run for a few days on a single AA alkaline like a candle.