The good thing I noticed is there's no price increase when choosing the SFH55 or SST-40 so cost is probably low on this, unless it's not a real listing - they don't have it yet, who knows.
I can buy it in China
I don't understand - buy what? The LED, the light? Why can't we all buy the light? It's on Ali.
first test not so impressive: 7090 on 40T's ay 3.7V. Batts were quite low, topping off 30T's now...
2nd test on 30T's at 4.20V: 10302 lumens at turn ON -- better, but far from high ratings. Probably the Vf of the LED.
I could have done something wrong, dunno, but chance are it's the Vf. Will check throw...
Oh I thought you were saying that you didn’t believe the listing was real.
Can you test the current draw?
Well you never know til you got it in hand and can verify. "Buy" is just the first step 
Throw taken at 5 meters, just 2 sec pause (not 30): 514 kcd. Expected to be lower but this light did about 1050 kcd at 5 sec pause on the SBT90.2, and for lumens did 6120 at turn on on 30T's.
So compared to the SBT90.2:
Lumens: 6120 --> 10300
Throw: 1050 kcd --> 514 kcd
Both sets of #'s at turn ON.
Amp measurements can be made - easier on one 30T, not so easy on the carrier with 3 of them.
Yeah a bit disappointing since the claimed intensity was about 5/7 of a SBT90.2
Perhaps there is a lot of die to die variation.
Little messy, but measured amps on one 30T at 4.14V: 32.8 amps. Lumens at turn on: 9605.
amps and lumens was measured with the cell directly on the driver spring, 14 AWG between batt- and driver grnd ring.
This seems to indicate the 3 cell 21700 carrier has some losses, even though I modded it up with bypasses on springs, etc.
Guess for lumens, this puts it in a territory of a triple XHP50.2 3V light I've modded - about 31-32 amps, about 10000 lumens.
I’m not sure I understand. So it’s about 90 amps for 3 cells in parallel? If so, the efficiency of this emitter is terrible at these currents.
No, not even close. Running cells in parallel lowers the resistance which is why you get and should get a bump in amps, but the bump is not significant, but all depends on the LED's Vf and other resistance factors.
The LED throttles amperage based on it's Vf. All LED's have a rising Vf as the amps increase. So as amps go up, the Vf goes up, further restricting the amps. Basically you would never double amps by adding a 2nd cell in parallel, unless you had intelligent buck or boost circuitry that can handle high amps. Buck and boost driver are relatively cheap except when handling high amps, then they can get more expensive. I dunno what kind of boost circuitry would handle 40+ amps for example. Maybe it's possible but probably gets very pricey, big, and complicated. But I'm not the right guy to conjecture on this stuff.
The beam has no XHP halo effect, but did notice in closer distances, say under 10 feet, the hot spot is consistent white but further out, still indoors, the hot spot has an inner more yellow spot and the hot spot itself get fuzzy around the edges. Focus seems ok because you only see a center black spot under 1 ft or so. But dunno - didn't play with focusing at all.
That table is nearly useless imo. Highly inaccurate.
As I said, the die area is in the ballpark of 4x the 90.2, so you could expect roughly 1/4 the cd/lm.
This means you’d need ~4x the lumens to match the throw of the 90.2.
Using Tom’s numbers, which is showing a 2/7 cd/lm between the two, that would mean you need 21.4k lumens to be equivalent.
Assuming 3.8Vf, and 60 lm/W otf on the top end of this emitter, that would come out to amps in the low 90’s.
I just don’t see it happening based on prelim tests.
Oh I thought you connected all three batteries and was taking the current from one of the batteries. Thats the way I was thinking about measuring current from my multicell JKK80. In that case I think it should be close to 3x the single cell measured current right? If the cells are identical.
Ohh, I suppose so in that configuration. With a carrier, think I could measure amps from all 3. Did this before and needed to solder in heavy gauge wires temporarily.
Mounted. The LED+ pad on the LED has a notched out corner which matched the MCPCB. Funny because the SBT90.2 had the notch on the opposite end of the pad, so didn't match the MCPCB (not shown here though):
Single pair of 18 AWG wires:
Nice moon mode with Anduril 2:
Hope we can get it here in eu,want to try the sfn55.2 in some small but powerful edc :smiling_imp:
based on the Nightwatch LED reference table re-posted,
the note indicates SFS80 LED "is to be discontinued" but it's being used by the Astrolux A03 and Astrolux FT03-Mini "Upgraded".
Also, there is "SFN55" LED in the table, but any idea if it refers to the same "SFN55.2" LED used by the Mateminco MT70 variant?
The comparison table lists SBT90.2 LED at 18 Amps yields around 4800 lumens, and at "max safe current of 31 Amps"
( "max safe current" probably just refers to the LED should not burn up at that current, although life cycle might still get reduced? )
SFH55 indicates 25 Amps yields 9100 lumens,
and 62 Amps yields 14100 lumens = but how to provide 62 Amps of power to the LED?
Maybe the 26980 battery offered by Nealsgadgets?