Clemence lists all of his E17A’s as R9080 except the 2000K and 2200K. But even the 2000K actually tested at R9080.
The voltage curves should be generally similar, although it is possible they are of different bins, and within a voltage bin, there can hypothetically be up to 0.2V difference at 350mA.
Output can be estimated by multiplying by the ratio of the output bins, which are given as BXX for the E17A.
So to estimate the 4000K (B11) at a given current, take the output of the 6500K (B12) and multiply it by 11/12. For the 2000K, multiply it by 8/12.
I am also interested in this. With the new Lume1 driver on the way, I would really like to put some E21a emitters in my fw3b to make it match my brass d4v2.
I’m looking at replacing my XM-L2 Convoy S2+ (which I use for night photography illumination) with something similar, but with warm, and neutral-cool high-CRI emitters. Would love to see a quad E21A Convoy S2+ (or in a similar host, with good range of brightness steps). The Noctigon KR4 now has E21A options, but as I want 4 lights (2 warm, 2 neutral-cool) that would be prohibitively expensive (and I don’t need silly aux LEDs).
Has anyone succeeded at replicating the tint of 219b sw45k using a combination of E21A (or even Optisolis?) The 4500K E21A on its own looks far less rosy.
I find the 4500K E21A already nice and rosy.
If you mix 2x 2000K & 2x6500 you will get VERY rosy. In this extreme case, the tint mixxing is very important, so you need to use the right optic.
Mixing E21A is advantageous for lower CCTs because there are no available LEDs with rosy tint at low CCTs and we can achieve <–0.01 duv by mixing 2000K+ 4500K or above.
good point, maybe… depends on what CCT is the desired objective
your post with mixing calculations were not lower CCT than sw45k, so I dont see a good reason to do that,
sw45k already works without the extra hassle of mixing different CCT, plus mixing LEDs adds an additonal requirement to use optics to blend the separate LED beams
Yeah, drgentr asked for 4500K so I tried to get close to it, I agree it’s not worth it.
For lower CCTs, here are the tints I get in a tint ramping flashlight for example :
Using 6500K-2000K would have lowered the duv even more, as shown in maukka’s test, and for a larger portion of the CCT range. (also in this flashlight the leds run at half current at the middle of the tint ramp, so the duv is not as low as it could be )
Yeah 2000K really bring down the mix into the rosy region compared to 2700K thanks to that BBL curvature into the red.
I made some measurements of the stock IF25 here , of course the sst-20 6500K are pretty bad. A few posts below I put sliced LH351D in it. But the CCT range is limited compared to E21A which allows to mix very spaced CCTs
I didn’t get a reply in the Hank thread so I’m going to try asking here in case anyone knows. How much does the CCT on the E21A get pushed up when it’s run at 1.2A versus the 0.7A in your tests? Like say 5000K would be more like 5500K and 4500K becomes more like 5000K?