Thanks. For whatever reason though, the link for the MCPCB pix throws a 404 error.
Got three today, put one in my B158B, direct drive and sliced.
I don’t have any numbers (well, none that could be trusted) but it outthrow the dedomed XP-L that was in there before.
Sweet! How does the spill look? Did you try trimming any of that extra side material that’s left over after slicing.
Did a led swap just now. Took a brand new sofirn SF36 NW xpl V6. My measurement came in at 960 LUMENS Sofirn advertises 1070 lumens.
Swapped In a sst-20 using the SF36 original 10mm copper mcpcb and also by passing both springs. Nothing else was done. Using the same battery, after 15 seconds 1008 lumens.
Removed the tail, Using a short 10awg wire and unit-T clamp DDM I’m measuring 4.06 amps at tail.
Pros’s:
Much tighter and simply more fun beam.
Should now have better battery life.
Higher lux and lumens.
Con’s:
Lost the xp-l V6’s awesome neutral 4500-5000k tint.
Sst-20 tint reminds me of a 1992 honda civic with illegal HID headlights.(7000k-8000k)
How did you direct drived this SST20?
I got 3 of them. Putted two in my Fet TA driver Convoy L2 and when I switched it in turbo….instant death. I got three so I only left one. I think I will test it at work with a bench power supply how much it can take without dying. but this is sad news for me. I think it is not better than XP-G2.
hahaha damn
Well… it’s reflowed on a Noctigon MCPCB and there’s simply no driver at all.
That said I didn’t measured the current, but it was fed with a 30Q
Finally I got some SST-20-W from KD. :THUMBS-UP:
Test now in progress. Seems it's a nice LED, with 1600 lumens @ 6 Amps (domed), but with a bit greenish tint.
I'll publish my test the next days. :)
I reflowed mines on DTP copper MCPCB and didn’t have a chance to measure current.
Addendum: due to its much smaller die the luminance of domed SST-20-W @ 6,000 mAmps is as high as of XP-L HI V3! 
I received 10 from AliExpress yesterday. Reflowed on onto a 20mm DTP MCPCB and used it to replace an SST-40 an a F13 with a BLF A6 driver.
All I’m sure of is that it falls short of the total output of a similar light with an SST-40 and a Mountain FET+1 driver, but I think the mountain driver has a lower resistance FET.
Which is obvious, since it’s the smaller version of the SST-40. It should increase the luminous intensity (throw) though.
Okay, so I tested two of them in the following setups :
Amutorch JM70 TA FET driver : old emitter was a dedomed XP-L (warm tint)
Before : 363 X3 kCd
After : 400 X3 kCd
Convoy C8 Biscotti driver 8*7135 : old emitter was a XP-L HI (neutral tint)
Before : 100 X3 kCd
After : 120 X3 kCd
Please take this number as comparison only, I use my phone as a luxmeter :person_facepalming:
That said, I’m confident that the relative numbers are trust able.
So what I see is about +20% in throw at the same current.
Now I want to try a sliced one in the C8… might give a 10% bump in throw I guess
^ If you get to 180 kcd (not phone kcd :partying_face: ) in a C8 you are in dedomed old XP-G2 S4 2B territory.
Yes, very good. Have a 
What wasn’t obvious, to me, is whether it actually achieves higher intensity, which may be down to my poorly controlled testing conditions.
Koef3, I’m looking forward to your write-up!
Luminance is based on lumens per area of die size. So if you know that the SST-20 has 30% less lumens and is 50% smaller (for example), then it must have a higher intensity (luminance).
I managed to make my convoy L2 not kill my last sst20 and at 5.1A current I measured 1240 lumens and 233 kcd with stock led and dome on. Next step is to shave the dome and polish it.
That’s assuming equal polar distribution of course.
It’s only that simple if the LEDs are flat with no dome and have a perfect sinusodial distribution.
If they have a dome then it would depend.
Any update on this test? 