I see, I just wanted to put four 5K LEDs on one board to get 200+ lm from a single LE. I am just wondering now if there are any triple or quad 2-pad boards…
There’s one possibly positive thing about mixing CCTs though. If you happen to get two mildly greenish emitters with large enough CCT gap, you can mix them and land closer to the BBL since the average is completely linear.
Ra/R9 of 95/85 minimum is pretty exciting, though that emitter doesn’t look good for flashlights. A panel with 200 of them would be fun, much like the Viltrox camera lights.
The actual spectrum of any “white” LED is a strong peak in the blue, a dead zone around teal/bluegreen, and then a slow rise towards the yellow/orange, then falloff in the red.
If you were to combine the 2 individual spectra of, say, 4000K and 6000K, it wouldn’t exactly equal the spectrum of a 5000K LED. Being that cooler lights are generally a little more efficient, you’d be able to guesstimate its combined CCT to maybe 5100K instead, but the balance of all the individual colors wouldn’t be identical, even if you were to have a 5100K LED.
It’ll likely be close, but not exact. And the result can be a lower CRI if they’re not “in balance”.
The Optisolis is currently still under preparation to hit the market. It’s light quality is simply Nichia’s best to date. Far better than E21A 9080.
I made a spectrum comparison pictures in the product page, please check it.
But….It’s a very low power LED rated for only 0,3 watt per LED.
For flashlights uses, even the “modest” R9050 light quality is already extremely good compared to “common” CRI. As long as you are not lighting up next to someone else with Yuji or Optisolis of course.
I wonder if there are any 16/17mm triple mcpcbs with 2-pad contacts, suitable for the optisolis? I think that standard xp boards could be used if the central pad is insulated by kapton tape but the LED would sit on a very narrow margin of the pad. I’d rather avoid this hack
Someone has messed up those graphs above: in the 5000K graph it seems to me that R9050 and R9080 is reversed, in the second graph the red line is missing.
Clemence wrote; Correct! Mixing several different CCTs will also (in most cases) results in lower CRI than individual CCT. You can check Maukka’s test to see it. It’s more like a trick.
Nothing changed, everything is as shot except exposure adjustments (those were two different flashlights with slightly different brightnesses). 219C has greener tint while E21A is right on the target (check Maukka’s chart below)
WB adjusted to get rid of tint differences. This 219C has R9 = 76, one of the best 219C in my collection. But E21A still wins.