The XP-G has not caught on with the general lighting manufacturers yet, and our own CPF modders are doing the most with them. I have not committed to having any of my lights modded for it yet, and am happy with my XR-E, and Seoul P4 offings at this point. Seems like if I get going with the XP-G then another awesome LED will be out. Where does it end, and are the gains worth it? What I would like is low vf in an LED, and high flux that would be maybe 50% better than what I have in a single die LED. Then I think that the move would be worth it. Remember, we went from the Lux III to the XR-E for almost a 100% gain in output, and that was really worth it.
Bill