Fivemega Elephant II, 8 emoli 18650 cells (from Makita BL 1830 drill battery), driving a 64657 (250W) bulb. I have one with a 3" reflector and an AW soft start switch. The amount of light from that size is amazing, supposed to be about 16,000 lumen. Caveat; AW doesn't rate his switch for that power level.