Received my 62w yesterday. There's a lot of good info in this thread already but I thought I would add a little more. I won't speak to much to the physical qualities of the light other than to say everything is perfect... ano is even, clip is tight, emitter is dead centered and the button is nice and clicky (best yet from a Zebra). As to tint, I can't complain. It's as good as any neutral XM-L I've seen short of one of Vinh's hand picked anomalies. What I focused on was the PID controlled output.
The following graphs show relative output and temperature respectively. Both tests ran for 5 minutes and data was taken every 10 seconds. Output was measured with my lux meter and a ceiling bounce. Temperature was taken with a Fluke infrared thermometer at the center of the head. The room was about 85 degrees and the light was tail standing on an insulated surface (thermally isolated except for convection). Please note that the minimum of the Y axes are not zero. I cropped the operable range for visualization purposes.
On the output graph, you can see that after about 5 minutes the output is reduced to just over 60% and the light is able to dispense with the heat as fast as it is generating it. With the lux meter, you can visibly watch the small step downs occur. The output will hold steady and then abruptly drop a small amount, only to hold steady again. This happened once or twice between every measurement. It's quite possible that held in the hand, moving, or mounted to something, the light would maintain a significantly higher percentage of its full output.
As you can see on the temperature graph, the light heats up to its maximum temperature in about a minute and then holds very steady at just over 120 degree thereafter. The small variations in temperature after 1 minute are probably due in part to my inability to take the temperature at exactly the same place on the head every time. It's astonishingly consistent.
In general I'm very happy with the light. It's actually just a few millimeters shorter than my current EDC (a Malkoff MDC head on a Surefire E1B body) and no larger in diameter but it has several advantages that I can see: Has crazy output on high, will go very low, can reach High and Low from off, has a battery charge indicator, and of course IT CAN HOLD A PROTECTED 18650! That last one is what really gets me. I could not imagine EDCing an 18650 light but it feels great in the pocket. I just need to get in the habit of grabbing it from my pocket in the underhand grip vs tactical grip.
Hope this helps someone out there and I hope those of you awaiting one of these in the mail get them soon.
Cheers!
-G
EDIT: I was curious so I went back and re-did the test using my hand as a heat sink. I kept my hand wrapped tightly about the light, switching hands roughly every minute (it got quite hot to hold in one hand) and I was able to maintain ~ 90% output all the way to 5 minutes where I ended the first test. It seems like in real world use, you wouldn't be completely wrapping your hand around the light and holding tightly but surely you would benefit from the effect somewhat just by casually holding it in your hand. My guess is somewhere in between 60% and 90%... 75%?
