I don’t see why not. I’m fairly sure all of his 1*18650 hosts can accept all drivers and emitters. I even asked once about putting the new Nichia on an M2, and he said “of course”, so I’m happy.

That’s a lovely combo, and I don’t see how it wouldn’t work. Did you ask for a smooth or OP reflector?

The wording on the third point confused me a bit, so I feel I should make it clear: there’s a pretty big difference between the S2 and the S2+.
· The former is an older design, longer and with a very deep reflector. The beam is tight but floody, almost as uniform as a low-angle TIR optic.
· The latter has a much shallower reflector, and is very floody as a result. Folks around here have tried putting an XP-L HI flat dome on it, and with a smooth reflector, it throws pretty damn far. Simon also has a gamut of optics for it, with different angles to pick from.

4000K was my choice for the S2+, too. I like my flooders on the warmer side. I’ll pick the 5700K for the M2 in the future.

Indeed, it’d be very close to 7 hours on a fatter battery. I just like the crazy long runtime, hence the high capacity of mine.