Sofirn HS21 has two white emitters: the low-CRI Spot at 6500K and the high-CRI Flood at 5000K. You can combine them. The hybrid beam is dominated by the cool spot, but also has warmer, better-quality spill which makes it useful overall. The mismatch in the CCTs can be probably lived with.
I wonder how much better (or worse) a light sporting two emitters (spot and flood) with more similar CCTs can be? Are there examples?
With similar spot/flood CCT the situation is much better. There are dual-channel quad lights (D4V2 for example) where people choose different emitters for the channels. Two floody (or throwy) channels with different CCTs, such as 519A 5700K+2700K, works well. A floody channel and a throwy channel of similar CCT (519A 5700K+Osram, or 519A 4000K dome+5700K dedome) work well.
When there is a huge CCT gap between a flood channel and a throw channel, the combined beam is super ugly.
agree
personally I see no value in combining the beams
Because the flood beam has such a nice even brightness across the beam, I see no benefit to adding the spot beam at the same time…
imo, the spot beam and the flood beam are best used independently.
I would be tempted to replace the Low CRI Cool White SFT-40 with a High CRI model (without tryiing to match the CCT of the Flood LEDs:
Oh, and how did you open it up?
And what are those black items next to the two of red LEDs?
I’ve never done it, but what happens when you put this thing on a hot plate to just change the centre SFT40 but want to leave other LEDs alone?
External Circlip Pliers:
thats fine, if you dont touch the other components, they stay where they are
Here is a modding sequence album for the TS10SG, it also has extra components that I did not touch when I replaced the center LED
Is there a sign for a Hall probe on evidence? How does the dial work?
I cant answer those questions for you.
You could if you disassemble the rest of it. 
You know, in the name of science. 
I kinda like the color mismatch on my 2 dual channel lights(Wurrkos HD15 and Sofirn HS20).
Fo one thing when I first click them on, especially at short range indoors, know exactly what channel I have(less important on the HS20 unless I might hit the wrong button) .
But I almost never use the spot emitter, generally always flood, and thankfully they’re going warmer on flood not the othercway around.
When I do want the spot its either to add to the flood to add distance, while leaving flood on for pariferal vision, or when I want really bright Right Now, and the higher K is brighter, or at least looks brighter for the same output. Like when I want to spotlight the prowler at the end of my driveway at 90 feet, I just want bright and distance.
For a sustained use hand light with that beam profile, yeah I’d want warmer. But where its an augmentation or completely different use, I’m liking the reach of the cooler LEDs.
Honestly not sure I’d want them to match actually.
I wonder if SFT40 low CRI 5000K instead of the stock 6500K would look noticeably better in HS21
Low CRI just doesnt work for me. Even if the color temperature and Tint DUV match, the color rendering wont.
I just want to point out that with HS21 stock emitters, the cooler and poorer-spectrum Spot gets warmer, richer, and wider when supported by the Flood.
How is the SFT40 3000K working for you (in unison with flood)?
Hmm. That is a bonus I have when picking lights and LEDs; high CRI is pointless.
I was wearing my HS20 for 3 hours straight last nigh outside working. Everything is either black, deep(looks black) green or solid white(dead of winter in Alaska) . A warm beam is nicer on the eyes, but there are no colors to render! Lol.
As long as the beam tint itself isnt green or too damn blue, just for not giving me a headache, I’m fine. I couldn’t care less about CRI.
Any time actual color seen matters for me, I’m not using a flashlight, I’m in an overly lighted building picking paint chips… At that pount high CRI lighting in Lowes is what I need!
I mean, yeah, I get it. At least in the tech and geeky side, its cool. It just never applies to real life use for me.
