I just received my SC600w MkIV Plus, and here are my initial reactions.
Very bright! I measure about 2700 lumens on max, right after turning it on with a fresh Sony VTC6 cell. This is higher than the 2300 lumens listed in the specs, so I'm rather surprised. I didn't measure it at 30 seconds, but perhaps it dims to 2300 lumens at that point? Has anyone done a proper output measurement of this light?
It gets hot on max quite quickly, and noticeably starts to decrease in output after about a minute. However, it didn't drop as much as I expected. I haven't measured what it stabilizes at, but it seems much brighter than what the SC600w MkIV HI stabilizes at. Good to know, because I intend to use it as a bicycle light on the H2b setting (which I measure at 730 lumens), and it should be well regulated considering the breeze it will get.
The outputs I measure on other modes are closer to spec: H1 is 2700, H2a is 1200, H2b is 730, H2c is 290, M1 is 150, M2a is 75.
CCT is 4400K. I might measure this slightly warmer than reality, but for reference I measure it 200K cooler than my SC600w MkIV HI. It's a decent neutral tint.
Beam is fine for real-world use, but it's not very pretty for white-wall hunters. Traditional domed Cree emitter look: white hot-spot, yellowish/greenish corona, and cool/purplish spill. By contrast, the SC600w MkIV HI has a fantastic even tint. I don't think the uneven tint will be an issue for outdoor use, as it's pretty common in all Cree emitters except for the HI variant. It's not bad, it's just not a Nichia 219 kind of beam.
It's about as floody as I expected. A bit more floody than traditional Zebralights (SC62/64, SC52/53, etc). Which is good, since I wanted a floody light with good regulation and efficiency to use as a bicycle light. I'm tired of replacing the battery every hour on my current light because it has dimmed too much (BLF A6).
When it's dark, I'll give it a good workout. Damn these long summer days!
Oh, for shipping time to Canada via EMS, it took 8 days to arrive. Zebralight took a couple of days after ordering before shipping, so I think it was 10 or 11 days total. No duty, taxes, or brokerage fees; same as every other light I've bought directly from Zebralight.