Would reflowing 3000k,4000k,and 5000k 219c on a triple pcb, bring out more colors then just 90cri 4000k 219c,
My understanding is that it would not. My understanding is that the different leds could actually cause a drop in overall CRI. I have built a few mixed triples with 219b sw40 x 2 and sw45k x1 and the opposite and while the color temp changed in the combined beam, I do not have the equipment to test CRI. Also, the warmer the color temp, the lower the output. This would be visible between the 3000k and 5000k, I am not sure how different the 4000k would be from the 5000k, but it would still be less at the same drive current.
Matt, ya I understand the lumen drop, I’m a mechanic so it’s for close quarters, high cri when looking at many diff colored wire is a must, I’ve seen osram do weird things like add red emitter in the same led to make a certain color pop, so that’s where I got the idea from, that certain tints might bring out certain colors, my samsung lh351 5000k do nicely tho
I have two lights where I have mixed 219C tints, in my Noctigon M43 (4000K and 5000K) and in a Quad using 3000K and 5000K.
There is no noticeable difference in color rendering, and I have read previous posts that show that it can slightly alter the CRI both in the better and worse direction.
The main benefit to tint mixing, which is the reason I have done it myself, is to improve the tint and lower the DUV value. The two lights I modded with mixed 219C are now less green and more rosy. I haven’t measured the DUV rating, but its probably close to BBL and no more nasty green tint.
The tint mix of 219C has resulted in 219B quality light, with 219C higher output 
Pavlo, a 219b with 219c output sounds awesome, used to have the 219c meteor loved it. ya sounds like I’d be wasting me time really…trying to mix tints,
I wouldn’t say you would be wasting your time. I bet the 3000K + 4000K + 5000K 219C triple will probably have a better tint than just a 4000K triple 219C. Just don’t expect any difference in the color rendering.
On my single CCT 219C lights, I was using Lee Zircon Minus green filters to remove the green tint. By mixing the tints, I don’t need the filters anymore.
It is a waste of time but can be a fun waste of time , and it is a bit predictable so you can work towards a favourable tint that does not come in a single led. But as said above, expect no miracles like improving CRI compared to the individual leds used in the mix.
Edit: the last is not completely true, I once mixed a 80 CRI 2700K Cree XD16 with a 625nm red led and when the ratio was tuned a bit the result was I believe 2300K and 92 CRI. The reason was that the CD16 was well above the BBL and clearly lacking in red, the red led quite precisely filled that gap in the spectrum which improved the CRI drastically. As you noticed, household bulb manufacturers use that trick also.
I think I’ll give it a shot then. I remember when I had my
Wowtac nw and cw, I didn’t like the tint on either one but I put them together and it was pleasing to the eye, I even had them ducktaped together for a while, lol.