Prelim : 8.33V unloaded. 1.32A draw (not sure of voltage sag during that). This light is regulated. 2 x IMR 18500 from Bestinone.net.
You can operate on 2 x 18650 or 2 x 18500 (minus the extension). The 2 x 18500 turns this into a 200mm long power house.
Lux reading : 690 lux @ 8.17m, 46k lux @ 1m.
Wow, this little bugger matches my Solarforce Masterpiece Pro-1 figures! And on distant objects like 200m, they do seem to be equal. The XM-L has a larger hotspot, of course.
LED is perfectly centered, using the same mechanism as the Sky Ray STL-V2 and Oligt M3X. Hotspot has absolutely ZERO donut hole in the middle.
XM-L seems to be directly mounted on 3mm thick aluminum circular plate, the wiring probably runs within conduit cuttings cut on the aluminum plate, on the top part you see white plastic covering the alu. Well i don't know, but it seems high in quality. 3mm plate is screwed via 2 screws to the host tube mounting surface. 2 Screws are present, usual white thermal compound gunk used. Surfaces are smooth, so if you are anal you can use some artic silver here. Driver inside has PCB which touches the host, so no surprises here.
Light quality is very high for budgetlight levels. Reflector is smooth. Well I don't know....I only have a dereelight but next week I am gonna have a TK70, and week after next i shall have a Polarion PH40 coming for testing....well the PH40 is not mine its for a meetup at my place. LOL!
Very very satisfied with the light. I shall be buying a UCL AR coated lens to make the big reflector stand out, like the Solarforce Masterpiece Pro-1 which already has good AR coated lens fitted as stock.
This Fandyfire is definitely no junk at $46 (!!) shipped. With the low USD as the prices are pegged, BUY!
Panasonic NCR18650 2900s.
74.3 lux reflected, start time 0:10.
74.2 lux time 1 min 20 sec...starting to have localised heat saturation and starting to move
71.3 lux time 5 mins
5 mins = 4.2% drop in light. This mainly due to heat. The light is regulated. Ambient air temp is 29 deg C, HOT! Most of you will fare better.
The Ultrafire U-80 42mm reflectored XM-L 1x8650 got 65 lux initially here, same location. Drops gradually though from time 0 seconds and never holds steady. Prob a mixture of battery drop and heat.