Nichia Optisolis 2700-6500K color and CRI testing

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maukka
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Nichia Optisolis 2700-6500K color and CRI testing

Update 21.7.2018: More color temperatures tested in post #7.

Clemence sent me the Nichia Optisolis in 3000K and 5000K flavor for color and CRI testing.

The exact model numbers are:
NF2L757G-F1
NF2W757G-F1

There was four samples of both and they came already reflowed on Virence VR16S1 DTP MCPCBs. Each board had two emitters wired in parallel. The other pair will continue its journey to Koef3 for further testing. Also check out Djozz’s output test here.

The emitters are specified for up to 150mA (3000K) and 100mA (5000K) continuous current, but according to Djozz they seem to handle larger currents fine.

CRI and color testing was done at Nichia’s recommended current of 65mA (per emitter). For the tint vs. current test I ran my samples up to 200mA.

All tests were done with bare emitters with no reflectors or optics used.

Setup:

There’s practically no tint shift at all. Not with varying current or measurement angle. The tint is also excellent landing on or near the BBL.

The point of the Optisolis is color accuracy, which is excellent. I measured CRI(Ra) at 97 (3000K) and 99 (5000K) and R9 at 94 (3000K) and 93 (5000K). CRI also doesn’t change with current. The 3000K version seems to over saturate colors according to its TM-30-15 Rg value of 104. The 5000K one is more faithful at Rg 99.

Data for 3000K sample #2

Data for 5000K sample #2

The two different samples are very consistent. There’s very little difference in the spectrum between them.

CRI Data at different currents (per emitter)

3000K
10mA
50mA
200mA

5000K
10mA
50mA
200mA

Forward voltage up to 400mA (200mA per emitter).

The Vf is about 0.1V higher on the 5000K model.

Edited by: maukka on 07/21/2018 - 13:21
koef3
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Very nice color and tint, and extremely good CRI which are equal or even better than the Ledengin Gallery-white 3000 K (stated CRI 98) emitters! Well done Nichia!

Thanks for your testing, I'm very excited to see this LEDs and it's color for myself! Extreme testing would follow if I got some of these.

My LED tests: Cree SC5 based LEDs (WIP!)  ---  Nichia 319AT 83 CRI - Optisolis (3000/5000 K) - Lumileds Luxeon LXML-PWD9 - Luxeon MZ 5700 K (90 CRI, 3 V) - Luxeon V (CSP) 4000 K 70CRI - Luminus SST-40-W (+ dedomed) - Cree XP-L2 (+ High CRI variant) - XHP35 HI - XHP70.2 - CXA1304 COB - OSRAM OSLON Black Flat HWQP - SYNIOS DMLQ31.SGLE UW Q8WP - unknown 5050 LED ---- finished: JAXMAN M8 (Mini C8) HighCRI Triple

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Excellent review. This LED is really something else. And some great measurement and testing hardware as well Cool

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Well done Maukka, great test and setup. I’m drooling at those Rigol (can’t afford those of HKJ’s Ughh )
Your results matched the results Nichia sent me earlier. 200mA continuous use seems fine. It’s been almost two months they’re inside my light bulb with almost 24 hours daily use.

Thanks,
Clemence

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koef3 wrote:
Thanks for your testing, I’m very excited to see this LEDs and it’s color for myself! Extreme testing would follow if I got some of these.

Naw, not me. I’d take care of them and love them and give them a good home.

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

Evgeniy
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Thanks for testing.

Hmm, 3000K use blue ~440nm emitter, but 5000K use ~420nm violet emitter.
—————————

from datasheet : This product uses a unique red phosphor that has a slow response time; when compared with the blue die and green phosphor in the product, the red will fluoresce with a delayed pulse of about 5msec and have an afterglow for about 5msec after the blue die
dims. If the LEDs are operated with a pulse current, ensure there are.

Flashlights : custom (Jaxman E2L with led4power LD-4 drivers and 3xOsram CQAR.CC), custom Skillhunt H03 with Osram 3К/4К, Zebralight {H600fc IV, Sc600fc IV, H600fc III}, Jaxman E2(N219b), Convoy UV.
Previous: Zebralight {H501, H600W, H600W II, H602W}, NiteCore TIPCRI, A A01, Fenix L2D CE/CEQ5.

maukka
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Got some more Nichia Optisolis, this time the whole shebang: 2700-3000-3500-4000-5000-6500 K.

All the measurements can be found here:

https://imgur.com/a/uBXPI9n

The tint and CRI on these is amazing. The 5000 K is truly a daylight simulator with practically perfect color rendering. You can also see that the peak on the 5000 K and 6500 K emitters is significantly lower at the purple wavelength. The dip above it is also much shallower than the typical cyan dip in a LED spectrum.

Just look at the spectrum!

Here’s a 4000 K with the low peak at a typical higher wavelength and a clear dip above it which reduces the color rendering indices just a bit. But in turn their Rg value is above 100 which means they oversaturate some color a bit, which might be preferable to some.

I also tested the output on the 3000 K and 5000 K variants up to 400 mA. Somewhat surprisingly the 3000 K is more efficient on lower currents but as the current is increased the 5000 K flies past. Forward voltage is higher on the 5000 K one as expected. I found it also amusing that I happened to get a perfect average 3000 K emitter, since its output was bang on 24.1 lumens at 65 mA just like Nichia specifies.

The tint was only tested with bare emitters. There’s barely any tint shift as can be seen from the OP, but Clemence tells me that these don’t work very well in clear optics as a quad at least but a frosted one is fine. It’s could also be quite difficult to find a suitable reflector. My go to Pineapple OP one did exhibit clear shifts in the hotspot. However, a beaded TIR optic looked excellent.

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Thank you so much Maukka for such invaluable data. Too bad the 5000k doesnt have perfect duv or slightly negative duv. The hint of green kills it for me.

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I guess I’m not the only one skipping the 2700K, 3500K, 4000K, and 6500K spectrum tests. I waited and kept waiting for the other tests. Until Maukka sent me an email and told me it was there already…. Facepalm
Very nice Maukka. Big thanks. I hope your Carclo 10623 works with the quads.

- Clemence

maukka
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As Clemence posted on his sales thread, the L757 (2700-4000 K) can’t be installed in parallel with the W757 (5000-6500 K) series because the forward voltage difference is too high. Here’s a comparison:

I’m so happy I have automated this. Would have taken ages to put down those numbers manually.

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Yup, I know how it feels inputting those numbers. I did exactly the same 100mA increments too……manually. Does your Rigol comes with PC UI? Or did you build an add-on DAC hardware? Really like those sweep automation.

- Clemence

maukka
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The Rigol has some software from the manufacturer but it’s utter crap. This Excel file is just using some modified VISA VBA examples from Keysight IIRC which interfaces with the PSU over ethernet. The same thing is much easier to do in Python, which I use when doing the output measurements in the sphere, since it’s simple to integrate the spectrometer executables. Everything just gets written in a CSV file like this:

Voltage;Current;Power;X;Y;Z;Y;x;y;Y;CCT;deltae;CRI;R9;
2,6191;0,0072;0,019;33,509278;31,382019;10,213829;31,382019;0,446165;0,417841;31,4;2959;10,911796;94,9;78,7;
2,6558;0,0173;0,046;70,160871;65,747864;21,881268;65,747864;0,444647;0,416680;65,7;2974;10,125240;95,4;80,6;
2,6829;0,0274;0,073;105,653433;99,082192;33,895346;99,082192;0,442748;0,415211;99,1;2993;9,159034;95,6;81,3;

Where Y is the lux reading from the meter. This has to be converted to lumens of course, but that happens automatically when I paste the data into Excel.

clemence
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maukka wrote:
The Rigol has some software from the manufacturer but it’s utter crap. This Excel file is just using some modified VISA VBA examples from Keysight IIRC which interfaces with the PSU over ethernet. The same thing is much easier to do in Python, which I use when doing the output measurements in the sphere, since it’s simple to integrate the spectrometer executables. Everything just gets written in a CSV file like this:

Voltage;Current;Power;X;Y;Z;Y;x;y;Y;CCT;deltae;CRI;R9;
2,6191;0,0072;0,019;33,509278;31,382019;10,213829;31,382019;0,446165;0,417841;31,4;2959;10,911796;94,9;78,7;
2,6558;0,0173;0,046;70,160871;65,747864;21,881268;65,747864;0,444647;0,416680;65,7;2974;10,125240;95,4;80,6;
2,6829;0,0274;0,073;105,653433;99,082192;33,895346;99,082192;0,442748;0,415211;99,1;2993;9,159034;95,6;81,3;

Where Y is the lux reading from the meter. This has to be converted to lumens of course, but that happens automatically when I paste the data into Excel.

Thanks for the info! Now I know testing multiple LEDs is not that hard for you. More incoming Nichias for you then…. Wink
Slowly but sure, you’ve becoming the top one stop tester for us in WWW.

BTW, do you think it’s possible to spectra testing a male firefly? I’m serious here…

- Clemence

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Quote:
I’m so happy I have automated this. Would have taken ages to put down those numbers manually.

I have done everything manually in my led-testing years so I’m glad for you too that you automated it Smile
Quote:
BTW, do you think it’s possible to spectra testing a male firefly? I’m serious here…

My new spectrum-toy (a Mavolux Base) needs a minimum of 10 lux on the (7mm diameter) sensor to produce a spectrum, you may get that if you tape the firefly on top of the sensor Party . I do not know about maukka’s setup?

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

clemence
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A hotel manager asked me if I can find a suitable LED to mimic firefly in the hotel garden. He wants it to be as realistic as possible. Weird request but very interesting! Finding/programming a driver with random natural blinking is another challenge.

We can place several fireflies in a small light bulb diffuser in front of the sensor. But I don’t know how Maukka would get those creatures in Finland.

- Clemence

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link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

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djozz wrote:
I found this article from 1964 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2195396/pdf/95.pdf

Wow Djozz, very informative document you got there! Big thanks. I’ll try to find the suitable LEDs for it. Different species different spectral distributions too. 500nm – 700nm seems to be the range. But the peaks are species dependant. Now I’m thinking to lure fireflies…..

- Clemence

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It looks like a phosfor converted green has about correct width of the emission peak but has the wrong peak wavelength (520nm for the new E21A converted green). The Rebel PC-lime however has its peak at 545nm which comes close to some of the firefly species tested in the 1964 article.

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

clemence
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PC lime… interesting….
Let’s see if the next E17A green samples I will be receiving looks good. Want some Djozz? Wink

- Clemence

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Of course I’d love some. Brand new leds, hmmmm Love

A quickndirty spectrum of my flaslight with Rebel PC-lime:

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

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djozz wrote:
Of course I’d love some. Brand new leds, hmmmm Love

A quickndirty spectrum of my flaslight with Rebel PC-lime:
!{width:50%}https://farm1.staticflickr.com/856/42849611254_f34570b6b9_z.jpg!

This should be enough to satisfy human eyes. Nobody would see the difference. Where did you get that PC Lime Djozz?
I will send some Red Green Blue Amber E17As to you when I get them.

- Clemence

djozz
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Not sure where best get the Rebel lime at the moment, I got them years ago from a portugese aquarium seller that has disappeared since. I see Ledsupply, Luxeonstar and Digikey, so all american sources. There is a Luxeon Z with the same colour as well at Digikey.

Btw, I have quite a stash (30 or so, would have to count them) of 20mm Rebel Sinkpads doing nothing, got them free from vestureofblood a few years ago. I could send them if they are suitable for your project (those Rebel lime leds put out up to 1000 lumen if needed Cool )

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

djozz
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I see that RS-online has the Luxeon Z lime (Luxeon Z has a simple two-pad footprint, like the E21A) for more than $5 a piece, a pretty expensive led but I could order there and send them.

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

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Thanks for the offer Djozz but let’s wait, until I get those Green E17A first. If they’re good enough then I don’t need the PC lime. Besides E17A form factor is better suited than the bigger lumileds. I think green E17A inside a yellow plastic cap (or yellow heat shrink tube) would look very close to the green-yellow firefly light to the eyes. I just noticed that my Armytek’s green switch LED looks somewhat PC lime behind it’s yellow silicone button.

- Clemence

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The Luxeon Z is tiny, hardly larger than its 1×1mm die. And what I remember from European fireflies the 530nm greens do not match that colour.
(Lampyrus noctiluca: )

(being persistent here Silly )

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

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djozz wrote:
The Luxeon Z is tiny, hardly larger than its 1×1mm die. And what I remember from European fireflies the 530nm greens do not match that colour.
(Lampyrus noctiluca: )

(being persistent here Silly )

How did you install those Luxeon Z on it? Did you ask it to carry the battery pack too?

Anyway, I just checked one of your test that I never seen before. OMD, this thing is just too small. But yes, the colour spectrum is very close to firefly.

- Clemence

maukka
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Maybe you could catch the fireflies with Optisolis. Fired up the 5000 K quad at 4×100 mA without optics and it only took a minute after a fly started investigating it. Landed right on an emitter and made it its home until I turned it off…

To be honest, I have no idea if a single firefly would have enough output for measuring.

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Quote:
How did you install those Luxeon Z on it? Did you ask it to carry the battery pack too?

It has a hydrogen fuel cell, didn’t you notice the small hydrogen cilinder between the legs?

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

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Ages ago I took a 555 timer and fudged about a 5-10sec period and fractional-second “on”-time, and used a 3V yellow Christmas light bulb as a firefly lure. Kindasorta worked. A bunch would flit around the yard but nobody would get too close to investigate.

They probably figured there was something hinky, and didn’t want to get too close.

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

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djozz wrote:
Quote:
How did you install those Luxeon Z on it? Did you ask it to carry the battery pack too?
It has a hydrogen fuel cell, didn’t you notice the small hydrogen cilinder between the legs?

Kidding Djozz. I know about the natural fuel it carries. It’s just your firefly is much greener than ours. Here’s it’s closer to green-yellow.

- Clemence

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Lightbringer wrote:
Ages ago I took a 555 timer and fudged about a 5-10sec period and fractional-second “on”-time, and used a 3V yellow Christmas light bulb as a firefly lure. Kindasorta worked. A bunch would flit around the yard but nobody would get too close to investigate.

They probably figured there was something hinky, and didn’t want to get too close.

It could be your timing was spot on to their sex signal. There’s a very good documentary movie about it by the legendary Sir David Attenborough: “Lights On Earth”. Watch it for free in YouTube. Firefly also one tricky creature which can fool other male to get the female by sending false beacon.

- Clemence

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