I've got a couple of these Magicshine clone lights. The both have an XM-L led emitter but the controllers are a little different.
Light one has high, low and strobe. Light two has high, medium and low.
Both lights on high draw 1A from a 7.4V supply.
|Function||Light 1||Light 2|
A battery pack made from 2 of the new 3400mAh panasonic cells should power these lights on high for almost three hours.