At 2-3 amps, maybe 450-500 lumens? It depends on what xpg3 is in there, could be a cool white. Either way, they have a low vf (forward voltage) so controlling the current is important especially from power tool batteries. As suggested, once you get it working with the new driver, maybe swap that emitter out for one with better beam quality and one that will be happy at 2-3 amps like a neutral white XML2 or Samsung LH351D high cri.