there is a specific room for REVIEWS…. why do post here? 
Interesting—only 2mm wider head, and 20mm more length than the
AA/14500 Manker T01.
A word of caution, do not remove the rubber USB cover, I was unable to get it back on.
Whoops.
Very informative review Leif, do you have a DMM to take an Amp reading? I’m between this one and the new SC600 MK3, but the ZL draws over 4.2A to produce only 1100lm from an XHP35, not very efficient compared to a regular XM-L2.
+1, any ideas on the mh20 vs U11? Quality, beam interface? The price is close of you get the deals.
No I don’t, but I’m hoping a more complete review will appear on this forum from Trevi_lux who can measure the output properly. I’m surprised by the output from the U11 and wonder if it really is close to 890 lumens on turbo 2. I am tempted to buy a proper light meter, I wonder if someone can recommend one.
OP updated with output plot on Turbo 2:
Output
I ran the light on Turbo 2 specced at 890 lumens with the Keeppower 18650 3100 mah battery:
Measurements were taken using a HS1010 light meter, timed with an analogue watch, so the times are not precise. There is a modest drop in the first few minutes and then almost constant brightness for about 80 minutes, after which the output drops dramatically. I cannot measure the lumens output, but it seems noticeably brighter than my SWM M40A XML which produces roughly 600 lumens. This in my view is extremely good regulation. Clearly lower levels can be expected to be as well regulated.
Very well done. It does seem like a good regulation to me, the drop is because of the high temperature I suppose, Manker says the U11 has constant current regulation.
Also, excellent runtime… 800+ lumens for 90 minutes is very efficient.
No not 800 lumens, 800 arbitrary units, I cannot measure lumens. But I do think it is well over 600 lumens, perhaps even 800, who knows.
Yeah. CR123A batteries are rated for a maximum continuous discharge current of 1.5 amps. When you start going above that, the voltage sags terribly.
2xCR123A flashlights usually work well at outputs up to about 650 or 700 lumens. When you start to ask for more, the current draws become excessive.