It doesn’t say, you need to ask for a quote.
Also it’s actually 2000 min not 500, the 500 is for a ‘dummy sample’, whatever that means.
https://octopart.com/search?q=KW%20CSLNM1.TG&start=0
I will look into…
I got my 10 SST-20’s LEDs from aliexpress yesterday, so today i rigged up a DC-DC buck driver powered by 2 sanyo GA,s. Measuring Volts with a cheapo MM. Measured amps with a Uni-t clamp meter. And lumens with a lumen tubes I copied off of VOB’s utube video(that has been surprisingly accurate).
The lead wires are very long, so I’m sure voltage sag is happening.
Here are my numbers. Take it with a grain if salt, or boulders of salt.
Lumens started to flatten out at 3.67 vf,and 5.61 amps resulting in 1104 LUMENS.
I pushed it to 3.82vf and 6.41amps but zero gain or loss in lumens. Not sure what this means. But LED seems fine
Nice rig Redlyne22!
If the board is a DTP board (I assume it is), the current capability and light output of the SST-20 is not impressive.
so 1100 lumen max, great upgrade from xp-g2 i guess
Not impressive indeed, if the lumen number of 1104 is accurate. Compare that to the XPG2 S4 with 1300 lumens at 4.75A.
I was hoping for XPG2-like performance but with a low Vf.
Thanks man. its no where near the level of accuracy you test at. Mcpcb is copper but not sure if its DTP. The mcpcb is what the leds came on from aliexrpress. maybe I should reflow them onto a Maxtoch and run numbers again.
I’ve seen your tests. You are great at testing LED’s. So I’m all ears. Any pointers would be greatly appreciated
For the re-test, this is what I’m thinking to change.
- Reflow onto a known DTP mcpcb
- Shorter LED wires.
- ? Put a reflecter on the LED ? Maybe a P60 SMO reflector.
- Active Cooling.
I did the test fairly fast. As soon as I wrote down the results I raised the input,not allowing it to cool. should I wait and allow the LED to cool down.
I’m almost certain if I retest I’d get higher lumens, but higher lumens is not what I want, I want to be more accurate in this re-test. Either way, I’m fully open to recommendations.
Yeah, too bad, but maybe there are other benefits like a better tint after de-doming, easier de-doming or similar. It’s actually quite interesting that it’s not any better since the SST-40 is so efficient and has such a high max.
It is all relative. When I started led-testing I was in awe of BLF member “match” who had made an actual integrating sphere. He disappeared from BLF and then I found that someone should continue testing leds so I started with ceiling bounce led tests with a crappy luxmeter. And those simple tests were really valuable for modders compared to no testing at all, as is your test now. I refined things a lot over the years to get more accurate results but that is more for my own fun than that those more precise data have become so much more useful.
And now I’m in awe of maukka and Koef3 who clearly made test rigs more advanced than mine 
One test of one sample, of an unspecified bin, from one AliExpress seller doesn’t seem to justify the conclusions being reached here.
The datasheet shows a range between low and high bins of ~1.6x.
I’d at least want to see how the SST-20s that Kaidomain is selling stack up.
Also, FWIW, there are copper 20mm non-DTP MCPCBs for 3535 LEDs out there. I got one when I sampled the MCPCB offerings of a similar but different AliExpress LED seller. The 5050 & 2x2 array of 3535 emitters I received from them are DTP.
Knowing it is from AliExpress I suspect (or hope) it is a non-DTP MCPCB that caused the poor performance. It really seems like we should expect analogous performance to the SST 40.
For what it’s worth I will test the ones I get from KD when they arrive.
Btw, my SST-20 samples are on way from Kaidomain. (finally.)
Hopefully I get these next days or next week. Look forward to test these, including Vf / light flux depending on temperature Tj! :)
Ok fella’s, small update with some beam shots.
Made the changes listed above, threw in 2 new fully charged sammy 30q’s. hit 1300 lumens on startup(forgot to turn back down the vf and amp settings from yesterday’s test) Held 1300 lm. for 20-25 seconds,Then………no light. Ended up Burning out my lil dc-dc buck converter. But the LED lives!!! Confident to say 1300 lumens is a very realistic number.
Took the same LED. Sliced the dome and put it in a u-torch UT02 with mtn fet driver, 20 awg wires, and a 26650 Efest purple fully charged, After 10 seconds 1248 LUMENs with a beat up, aliexpress 1 dollar LED that i randomly selected from the original 10.
Heres the best part. The beam is tight. Real tight.
Shadow JM26 xpg2 S42B 870 lumen, has a clean dedome, Spent a ton of time playing with the focus to get 290k lux. But have to double check that. Might be 270k.
Vs.
The UT02 has not been focused, Reflector is sitting on the mcpcb. sst-20 Sliced dome. 1248 lm. No polish. Huge corona!! And Just like the sst-40 it produces some heat!
Side notes:
Shadow JM26 has a larger reflecter (guessing 4mm) then the UT-02.
Light output was lowered to the point were it complimented beam patterns and not max output.
For max output the UT-02 will significantly over-power the Shadow JM26
Maybe a good led to get more throw from small aa/aaa lights or tripple/quad lights with optics?
I will give a try to a Lumintop AAA Tool.
The sst-20 UT02’s beam pattern and corona kindof remindes me of a Acebeam K70. So I went back home and grabbed mine.
For the wall shots i have the output lowered to compare beam patterns. The sky shots are on max output.
Same 1248 lumen sst-20 UT-02. Nothing changed except a freshly charged battery
Vs.
Acebeam K70 CW factory light. 2210 Lumens. Mine seems to be missing a couple hundred lumens 
Sides notes: Wall is 40 yards away. Also, In person the hotspot of the sst20 is a tad bit smaller then they appear in the pics. Pics are still a fair representation of what’s going on.
Enjoy
Nice shots! Pencil beam :sunglasses:
So you moved it to a DTP MCPCB? That must be the reason for the increased output, right? Can you measure the throw of the sliced SST40 in UT02?
I think that large corona is from the lit up areas to the side of the die. I noticed this with sliced SST40s, especially if you leave the silicone on the side areas. Some light from the die reflects off the silicone/air interface near the edge and bounces around in the side areas. If you remove the silicone to the sides I’ve noticed it reduces this effect. Not sure if it would also significantly increase throw (instead of bouncing around to the side areas the light might instead reflect back to the die, increasing luminance). Not that a big corona is a bad thing, but if it increases throw significantly it might be worth it to remove the side silicone.
Correct, I reflowed onto a 28mm maxtoch, as far as that being the reason for the higher output, I really cant say for certain. It could be the cooler conditions. Or the much shorter LED wires. Or a large DTP mcpcb, Your guess is as good or even better then mine.
I actually had a sliced SST-40 and later a dedomed SST-40 in the UT02 (wasted a dozen SST-40’s until I figured how to properly dedome them). In the dedomed form It did just shy of 300k, somthing like 297k at 1850+ lumens. When it was sliced it did much much worse, I cant remember exactly, but if I was to guess, mmmmm 200k-220k
BTW, any california peeps looking to dedome SST-40’s I got the magic potion. I say california because we have to use the watered down crap called (low vac products) that are generally cat piss compared to the rest of the USA.
And you are absolutly correct about the large corona resulting in that extra side material from a sliced dome. My eyes get easilly fatigued, so trimming that side dome material on such a tiny LED is just outside my range of craftsmanship. I just started dedomong the sst-20. And daym. It’s way different then dedoming a SST-40!
I ordered 3 of them. I will try them in my fet driven convoy L2. One will be sliced, one will be dedomed and one stock untouched.
Could you test whether the original MCPCB was DTP? And sorry, I meant can you measure the throw of the SST20 in the UT02?
With slicing domes, the luminance is sensitive to how close you slice it to the die. Measurement of LED luminance as a function of dome thickness