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
1200-1300 lumens , intensity >= than xp-g2 (probably) , better dedome tint (based on sst-40 experience) , all this for 1$ ?
Can’t wait for this to be my favourite led for small throwers 
Good to see the improvements on the new MCPCB.
If you can take a few close-ups of the top of the original MCPCBs and post them here, it’ll likely be pretty obvious whether they are DTP or not.
As for testing them, in case you don’t know, on a bare MCPCB, just check for continuity between thermal pad and the copper core.
Center pad and the underside of the aliexpress mcpcb do have conductivty with each other. Soooooo, it’s DTP, right? Mcpcb pics below.
Also played with centering and spacing the sst-20. The beam pattern looks much nicer now. Its the only flashlight I have that has a negative tappering beam. Looks phenomenal.
https://photos.app.goo.gl/U5nz8SJv5CsMVhMe7
As far as lux goes, Was hoping for upper 2XX but it only came in at 216k. Alil shocking, since the beam looks so daym good.
And for the guys that asked about the dedome potion, it’s from a company called (Crown and its their Pro Thinner) the only place I can find it is from Sherman William’s retail stores.
15 mins boiling for xm-l2 and xp-g2. 30-35 mins boiling for sst-40s. it does not work on the sst-20. Or at least 50 mins of boiling doesn’t work. I’ll try one more time and boil it for 1 hour and make little cuts on the sides to help aid the seperation.
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.