+1 AA
The combination of Fenix 2xAA lights, rebel 100s, low self discharge Nimh batteries, and decent battery chargers makes for a nice light package. It may not be as nice as SF or custom rigs, but it's cheap and it performs well. The rebel LEDs bring high lumens, lower heat, and decent tint. The eneloops give you a cheap, easy, safe, rechargeable battery that holds a charge just long enough. Fenix gives you the best in squeezing a lot out of a battery in conjunction with high lumens in small packages. And as butt ugly as the L2D/L2T are, they grow on you. In a year or two as we see higher bin Rebels or other new LEDs come out and the lumens climb, these things will be awesome.