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

I’m quite surprised the E17A is not that far behind the E21A in terms of efficiency. If Clemence will ever make a 13mm board, I will buy a bunch. There’s so many AA/AAA/16340 lights I can think of that can use the 4xE17A

That depends on the current. On lower modes they are indeed very close(about 5% difference), except the fact that E17A has noticeably higher forward voltage, however on higher modes e.g ~700 lm E21A achieves 108 lm per watt while E17A only 93lm per watt and that’s already 16% which is not that small, at least for me, plus again higher forward voltage. Anyway, I’ll wait for the tests before drawing any conclusions.

UPDATE 191107: Color E17A beamshots added to the OP

[Clemence]

To the E21A and E17A fans, I need your opinion.

I will be modding 3 identical hosts with quad e17a virence board, and I can’t decide on which CCT’s to pick.
The max output with these hosts will be about 260 lumens using the e17a 9080 LEDs, with both floody and throwy optics.

I typically enjoy lights from 3000K to 5000K, but have never tried 2700K, and sometimes find 5000K too cool.
Any recommendations?

Option 1: 2700K, 3500K, 4500K
Option 2: 3000K, 4000K, 5000K
Option 3: 2700K, 4000K, 5000K

What are your favourite CCT’s with these leds?

2000K
4000K
5700K

Clemence sent me some E17As for testing, like all of them.

Go here for CRI results: Nichia E17A CRI test (integrated @ 350mA, 30 sec) - Album on Imgur

thank you.

Thanks Mauri, looks like the results follow E21A closely.

[Clemence]

Thanks for testing these!

It looks like somehow the 2000K was received in R9080 rank even though Clemence listed them on his site as R9050.

Thanks for the tests and happy to see they are as good as e21a!

Maukka, thanks for the test! What kind of reflector or optic did you test them under?

Added a CIE chart for quick tint checking.

Additional observation: mixing 2700K+4000K in different ratios would result in the 3000K or 3500K emitters almost exactly. Same goes for 4000K + 6500K which results in the tint for 4500K and 5700K.

Test was done integrated.

Output and Vf graph on the 6500K sample.

Anybody know what the approximate gain in luminous intensity/Throw is of the e17a compared to E21a under the same optic/reflector?

It looks a bit like a dedomed XP-E2 (low CRI) both in output and die size, but just a bit less, pretty good for a 95 CRI led.

So a quad e17a is about the size of an XP-G LED, and quad E21a is about the size of an XM-L LED.
Would you say the quad e17a will have about 40% more throw than the e21a at the same power setting?

Tint vs. current on the same 6500K version. Fast sweep with only 3 seconds spent on each step.

CRI data at a couple currents
100mA
500mA
1000mA

:laughing: Hahahaha, thanks Maukka. Your post makes me giggles. The color swings for 3 steps R9080 is the tightest.

[Clemence]

I tested only 2000k and e17 has a very low lm/w. And, generally. you get same picture in narrow optic (a smalled spot and seeming increase of range). A only advantage of e17 series is a rosy tint at a lower current than e21