[Reference] Nichia E17A/E21A (2000K - 6500K, R9050/R9080, color) CCT and tint shots

Ryzbor · 2019-04-19T17:45:47.000Z

3500K+4500K certainly would be helpful (to replace the D240)

4000K+4500K as a neutral tinted (?) 4250K

3*4000K+1*5000K if possible

SKV89 · 2019-04-19T17:58:15.000Z

2000k + 3000k. Ive been using this nightly. Curious what it measures. Thanks.

maukka · 2019-04-19T18:00:59.000Z

Ryzbor:

4000K+4500K as a neutral tinted (?) 4250K

Not much reason to mix such close color temperatures. The difference between 4000K and 4000+4500K will be practically indistinguishable.

maukka · 2019-04-19T18:07:14.000Z

Tested the difference. CIEDE2000 color difference is 1.44 which means there’s no practical difference. DeltaE >3 starts to be obvious.

clemence · 2019-04-19T22:37:01.000Z

Woohoo, finally Maukka chime in. I’m still on the road to Malang city when I get the notification to this thread. Drove 400km and still 60km to go… Man…LPS everywhere in Java island

[Album] LPS everywhere in Java

[Clemence]

maukka · 2019-04-19T19:01:53.000Z

Aren’t they just glorious (sorry, chart doesn’t reach warm enough to show 2000K, 2200K, 2000+3000K).

maukka · 2019-04-19T19:11:02.000Z

CRI data for all the emitters and some tint mixes. All except one mistake at 700mA per emitter.

2000K
2200K
2700K
3000K
3500K
4000K
4500K
5000K
5700K
6500K

2000+3000K
3000+4000K
3000+4500K
3500+4500K
4000+4500K (350mA per emitter, oops)
4000+5000K
4000+5700K
2000+6500K

Tally-ho · 2019-04-19T19:23:19.000Z

Thanks a lot maukka and clemence.

ToyKeeper · 2019-04-19T19:49:49.000Z

This is really cool, and I should definitely try some E21A emitters.

Any idea how a 2700K+6500K or 3000K+6500K combo would look? Ideally I’d hope to hit near 4200K with duv –0.008 or so.

Edit: On second thought, perhaps I should just go for the 4500K emitters by themselves. They seem just about right, aside from being a bit less rosy than desired. With the flat surface, it’d probably have a fantastic beam.

maukka · 2019-04-19T19:42:44.000Z

Here’s data in a big table:
https://docs.google.com/spreadsheets/d/1CERSuF2JvYtjsoyPh-wEZ0dG6fSI-FDCjcTEVMSppiw/edit?usp=sharing

I haven’t measured lumens yet, so the Y column is just relative brightness.

maukka · 2019-04-19T19:59:39.000Z

ToyKeeper:

Any idea how a 2700K+6500K or 3000K+6500K combo would look? Ideally I’d hope to hit near 4200K with duv –0.008 or so.

Open the chart in a photo editing program and draw a line between the emitters you’d like to mix and eyeball the xy coordinates at the middle point. Enter them to a calculator such as this one: Calculate Duv from CIE 1931 xy coordinates | Waveform Lighting

edit: as it happens, in my image the duv (with a bit of a multiplier) is pretty much the 1:1 pixel distance from the BBL, so that helps too

AEDe · 2019-04-19T20:10:12.000Z

maukka, could you hold total current fixed but change current of components that mixing?
It is interesting would it be trajectory of such kind or not.

maukka · 2019-04-19T20:49:39.000Z

Here’s the spectra and CIE plot for the E17A color LEDs

SRGB color space for reference

Only the CRI for the amber LED is of interest

clemence · 2019-04-19T22:48:52.000Z

Amber looks like a low CRI extremely warm LED. Mixing red and amber can produce something interesting…I request a test for this Maukka.
Red on the other hand is very close to Cree’s new 660nm XPE2 photo red except it has very wide spectrum coverage. A very good candidate for night vision friendly torch.

[Clemence]

SKV89 · 2019-04-19T23:00:44.000Z

Thanks Maukka for providing those extremely useful test data for us. I have a few questions.

1) Why does tint mixing drop R9 so much on the 2000k+ 6500k

2) Could the low R values for 2200k be a fluke?

3) If I remember correctly the batch of E21A you tested last year was much rosier. Is that correct? This batch seems to hug the BBL similar to the Optisolis.

Also a request if it doesnt require too much effort is if you can test 2000k+2700k, 2000k+4000k, and 2000k+4500k. Of it require much effort to setup the test then nevermind.

Thanks again for your hard work and contribution.

clemence · 2019-04-19T23:07:34.000Z

SKV89:

Thanks Maukka for providing those extremely useful test data for us. I have a few questions.

1) Why does tint mixing drop R9 so much on the 2000k+ 6500k

2) Could the low R values for 2200k be a fluke?

3) If I remember correctly the batch of E21A you tested last year was much rosier. Is that correct? This batch seems to hug the BBL similar to the Optisolis.

Also a request if it doesnt require too much effort is if you can test 2000k+2700k, 2000k+4000k, and 2000k+4500k. Of it require much effort to setup the test then nevermind.

Thanks again for your hard work and contribution.

Let me try to answer those.
2000K has quantitatively more red than 6500K. 6500K measured with D65 standard while 2000K with incandescent baseline. Combined, the resultant R9 will result in less R9.
Early test done at 100mA current. Some LED produces less CRI at low current, and more R9. Different behaviour for different phosphor chemistries.
2000K and 2200K rated at R9050 not R9080.

[Clemence]

goshdogit · 2019-04-19T23:11:54.000Z

These two scenes are amazingly similar!

What’s that game called, Clemence?

clemence · 2019-04-19T23:28:24.000Z

goshdogit:

These two scenes are amazingly similar!

What’s that game called, Clemence?

AFAIK it starts with something “…find hidden objects…”

goshdogit · 2019-04-20T00:14:49.000Z

clemence:

AFAIK it starts with something “…find hidden objects…”

Thanks, Clemence! :+1: I hadn’t seen this ‘hidden object’ game genre before.

It seems your image is a screenshot from a game called ‘Criminal Case.’

maukka · 2019-04-20T08:24:20.000Z

clemence:

Amber looks like a low CRI extremely warm LED. Mixing red and amber can produce something interesting…I request a test for this Maukka.

Amber+Red