Combine 4000k and 6500k to get 5000k?

[FBsLights]

@mattlward

@CollectEverything

By the way, regarding that CREE chromacity chart, I see 5D1, 5D2, 5D3, and 5D4. Do we know which of these sub-bins Hank’s 5D emitters are?

I asked Hank a couple of weeks ago because I heard that they were really 5Ax and wanted to confirm as I dearly love 5A2 and 5A3. He confirmed that he is using 5A4 currently. This puts them fully below the BBL and at a CCT that should be very similar 5A3 and on the cool edge of 4000k. Should be very nice, and I am going to have to order a KR4 with them.

The 5Ax XPL HI is also one of my favorites, although I’ve never seen a 5A4. I bet it is nice!
mattlward’s experience matches mine. Tint mixing is great way to dial in your favorite CCT and get below the BBL.

CollectEverything, you should consider the tint ramping version of the D4SV2. Ramping from 5A to 1A you could dial in the tint you like. You would still have the option of “full blast” with ~5000k and could play with the tint ramping to see how different tints look. Only possible downside is that it will be pretty far below BBL at ~5000k (a lot of people wouldn’t consider this a negative at all).

The Sofirn IF25 is another option for anyone wanting to play with tint mixing without doing there own mods or spending a lot. It has SST20 LEDs with 2x2700k + 2x6500k and tint ramping. I don’t really like either end of that spectrum with the SST-20, but anywhere in the middle looks great (at higher drives)! I’m really surprised that this light doesn’t get more discussion here on BLF. Since I’m not a big SST20 fan, I’m upgrading mine to LH351D LEDs. Just need to decide on tints.

FB

[mattlward]

Jon, valid E21A points… but man there is something about them at 3500k for low level use at night!

[jon_slider]

@mattlward

E21A …there is something about them at 3500k for low level use at night!

glad you are enjoying that option
after giving E21a 3500k several trials, I sold the lights I modded to that LED.

I then tried 219b 3500k, but I did not like the Tint being so close to the BBL, or above

Im finding the 219b 3000k has Tint more to my liking, a bit further below the BBL than the E21a and 219b 3500k LEDs

I also prefer the warmer 3000k, expecially after dark

otoh, 3500k is very popular with some OldTimers, for daytime EDC

choices are good, glad you are finding options you enjoy
we are certainly very fortunate… “spoilt for choice”

[CollectEverything]

@jon_slider

@CollectEverything

Either way, the 219b is a lower output emitter (right?)

no
ime the E21a and 219b have the same output (within 5%)

the more notable difference is that E21a is higher DUV… the Tint is less pink than 219b…

both are 9080 LEDs

I see no benefit to E21a over 219b… in fact, E21a is harder to work with, and requires a special mcpcb… whereas the 219b uses a common XP footprint…

I wasn’t comparing the E21A and 219b outputs to each other, but rather to all the other options. The LH351d, SST20, and XP-L Hi emitters are all higher output. I was saying earlier that for me the E21A fills the role that the 219b fills for others as a mix of high CRI and lowish output.

I don’t consider highly-pink to be a desirable trait in an emitter. I prefer closer to neutral.

[mattlward]

@jon_slider

@mattlward

E21A …there is something about them at 3500k for low level use at night!

glad you are enjoying that option
after giving E21a 3500k several trials, I sold the lights I modded to that LED.

otoh, 3500k is very popular with some OldTimers, for daytime EDC

we are certainly very fortunate… “spoilt for choice”

Hey… watch it! I am becoming and old timer!
And yes, the choices we have are amazing, remembering the days when it was only a low output lamp!

[story]

I just did a mod with the SST-20 today.
I have an IF25 and IF25A and I mixed the emitters to as follows

IF25 2700k/4000k
IF25A 4000k/6500k

I added two layers of Z3 - Zircon on the 6500k.

The final result is a neutral white ~5000k using iPhone app.
It looks exactly the same as the Q8 Pro 5000k with one layer of Z3 Zircon to my eyes.

I think it’s a good mix but you need to use filters.

[FBsLights]

@story

I just did a mod with the SST-20 today.
I have an IF25 and IF25A and I mixed the emitters to as follows

IF25 2700k/4000k
IF25A 4000k/6500k

Nice experiment. You didn’t even have to buy emitters.
I’m not a fan of the SST20. I just can’t get past the green bias at low current drive.
I wasn’t found of the SST20 4000k LEDs that came in my IF25A. Duv too high at low drive and just OK at higher drive. Since the IF25 LEDs were nice at mid tint ramp, I swapped them in to the IF25A. Now the IF25A looks good once the FET kicks in when ramping up the intensity. The IF25 now has shaved LH351D LEDs in 3500k and 5700k. I think I’ll swap the 3500k for 3000k to hopefully drop the duv a little more at mid tint ramp.

Tint mixing adds another variable to this hobby.

FB

[Photon_Master]

Wouldn’t that get you a 10,500K light? chuckle 4000k + 6500k