I modded an Olight S15 Baton with the led of the OP (also obtained from Kaidomain), it is its fourth led now but this one stays in. It is making a lousy 120 lumen at highest setting (stock cool XM-L2=260lumen, note that the throw will be hardly different from stock because of the small die-size of the SST-20) but the tint is perfect. Perfect as in the absolute sense, as you can see in the colour data. Either this led does particularly nice things in a small smooth reflector, or I got lucky with a led closer to the BBL than the led tested by maukka.
Hotspot on maximum setting:
Spill just outside of the hotspot:
In none of the output settings or postion in the beam the CRI got under 97.
The hotspot that the SST-20 produces in the S15 btw is tighter than the hotspot with a 219C.
Thanks for posting the test results. From the very few examples I’ve tried, putting the emitter in a reflector makes the tint yellower/greener. I’m surprised you got even better tint than tested by Maukka.
I initially put 4 of them in my D4, but I mainly use it indoor on lower levels…
So I replace 2 of them by some 3000K variant.
Now I have a 3500K ish beam with a nice CRI
The 4000K on their own are quite pleasant, at least under TIR (didn’t try in a reflector).
What I really like is that they have a small die (like XP-G2) so the throw is improved compared with 219C
Yes, it's very easy to see from that graph why is better to use 3000K+5700K emitters than 4000K+5000K emitters to get ~4500K tint, first combination has much better chance to be under BBL.
Yes, the 2700K to 6500K tint mixing should be done with an additional set of 4000K leds in between - I tried to tell this in the BLF lantern topic weeks ago for the exact reasons, which your last figure shows.
Thanks for those helpful graphs. My quad E21A 2500k with 2x 2000k and 2x 3000k is much rosier than just 4x 2000k or 4x 3000k variants. My quad E21A 3500k with 2x 3000k and 2x 4000k is rosier than just 4x 3000k or 4x 4000k.
From my observation, comparing emitters of the same CCT, below the BBL tint does not seem to tint objects as much as above the BBL tint so white objects look whiter with below the BBL tint where as white objects look yellowish/greenish with above the BBL tint. I’m guessing this is why members here said they feel mixing CCT improves color rendering eventhough all it does is give you more below the BBL tint.