That's quite a jump in mA levels! I guess I'd best unhook my 3 cell LS that I have (2 of them, on in white, the other in cyan) until I can get some resistors. I've only run the two of them for very short bursts. Maybe 10 seconds. However, on the white one, I have a good heat sink with a small electric fan. I'm sure it has been thought of on here before, but I took a heat sink w/fan from a PC processor and mated the LS with it. Obviously, one can't put that setup in a small flashlight because the fan needs it's own power supply. But I would think it would do a good job of keep the white LS cool, even running 3D size batteries.