The D1 host at CNQ is same as the T10 host at IO here. I just did a build with that host using a XM-L2 U2 1C/SinkPAD, 3.85A Nanjg. Of course with my SinkPAD issues, I'm getting only 3.19A measured on a fresh Pana 3400 unprotected, but still does 924 lumens @start, 901 lumens @30 secs which is pretty good. Expect higher #'s on an IMR. Though it doesn't have the side switch, this is one quality host! I really like it, though it's not a mini throw with that OP reflector so much but puts out a nice beam of light, a bit heavy specially with the copper and brass pill insert I added, but with that weight and finish on the host, it's a quality feel! With an IMR and AR lens, this light would be ideal for this compact size. The modes I programmed are moonlight-lo-med-hi-nasty strobe-battery status/2 blink beacon. Using luxdrv as the basic, so mode changing starts at the 1st mode so yo necer have to see the strobe/beacon.