Well, I ordered mine from the auction site, it came in two days from a North Miami Beach address.
But, no ballcap. :shakehead
Looks like very fast service either way you order. :thumbsup:
I've got U2's, a Kroma Mil-spec and a UB3T and I still somehow got confused over which ring on the head rotates.
I tried to turn the ring with the hash marks and it was frozen.
After a moment of reflection (and mild self-imprecation) I realized that the smaller ring with the dot on it is the part that turns.
I tried a 17670 on high, and there is an almost immediate step down in brightness. I do not have a way to measure the output. Also, the selector ring has notches, or clicks for the outputs, it is not smooth like the original.
I tried a Keeppower 16650 and it cycled continuously between the two highest power levels so it seems that the single cell option will not work well with this light. Two Tenergy LiFePO4 RCR123A's work fine with all power levels. I'll let someone else try the overvoltage test with the fresh off the charger 4.2 volt RCR's. The date on the included SureFire batteries is 04-2026 suggesting that these lights were packaged in recent months and not sitting in the Raiders of the Lost Ark warehouse for a couple of years before finally being released and cancelled.
The feel on the selector ring is a little gritty to me when compared to the silky smooth U2 and the slightly less smooth with detents UB3T.
And, looks like an original U2 body, which definitely takes the 18650 (sometimes you have to remove a plastic insert), will work with this light. It appears that the UM2 body is a very minor modification of the U2 body with almost the same milling and a different clip. Is the tailcap a longer version of the Z41 on the U2 perhaps? Or is it the same? Maybe a little Lego time between the UM2 and U2 in the interest of science?
Well, I got a late model U2 (a U2A here on CPF) out of the drawer and tried the Lego with the UM2. The tailcaps seem to be identical with a beautiful matte black finish. I believe this tailcap is similar to the Z59 but was never sold separately with this matte finish.
The bodies of the U2 and UM2 are very similar but
not the same from I can see. Although the tailcaps appear to be identical, the tail threads are not exactly in the same position on the tube. You can swap the U2 and UM2 tailcaps and both lights work. However a Z49 tailcap works fine on the U2 (even thought the finish is shiny, not matte) but does not work on the UM2. The Z49 doesn't seem to tighten onto the UM2 threads far enough to get that last millimeter of contact somewhere.
And, the threads on the head of the UM2 are of a smaller diameter than the ones on the U2 so a head swap doesn't work at all.
My UM2 appears to be toward the green corner of the chromaticity diagram when compared to the UB3T. Of the lights I have handy for comparison it seems to closely match the tint of a SF EB2. But the tint is not really objectionable compared to some coke bottle green lights of yesteryear.
No visible PWM at any power level that I can see.
Great light, too bad it is discontinued. :shakehead
