I am using a M6 head on a Leef 3 X 18650 C size body. The bulb is a Lumens Factory 1000 Lumen type & AW IMR - 1600 -18650 cells. Lots of output and a nice unit although very long in length. Anyone making a complete LED head with driver module - lens - bezel - ready to swap that would be even brighter than what I am running? Lumens Factory used to offer a M head with a P7 but I no longer see on their web site? Discontinued? Any other brand available out there?