That Y3 is 65K at stock 2A at the emitter. With a resistor mod (2x26650) bumps it closer to 5A at the emitter. No mystery that a dedomed XM-L2 U4 will out throw XPL HI. 26650s @ 5500+ma vs the best 18650 @ 3500ma, capacity is not an issue. IMO the best feature of the M24 is weight and is easiest to mount to weapon platform. At around post #166 Tom E does almost the identical mod I referenced to build mine complete with UCLp lens. The only major difference was his used a U2 vs my U4 binned emitter and our different method to obtain focus.