I have two BTU Shockers that I got kinda late in the game. I got em with parts missing and even had to make some parts, but the reflectors were there as was the glass.
One of them is now a Triple XHP-70 with dual battery carriers… one allows using 2 18650’s and the other is set up to run 6 18350’s. With the 6 half cells it pulls 14,455 lumens. I wasn’t pleased with the beam profile from the multi-die emitters in mirror finished reflector cups, so I put individual TIR optics in each one (glued the optic into the reflector cup with NOA61). Beam is nice, no artifacts, and it does the 14,455 through these optics, so all is well. I ran it very briefly on 3 18650’s and saw 20,000 lumens, but the copper traces vaporized on the battery carrier and I haven’t tried it again since I rebuilt them.
The other has 3 of the 9V MT-G2’s in it, with the battery carrier working as normal…3 series 18650’s. It does right at 10,000 lumens.
I’ve thought about selling the XHP-70 one, but just haven’t. Love the MT-G2 variant.