Test of a Luminus SST-20-W 3000K 95CRI led

Flashlight Modding and DIY Parts
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(led in pic has broken bond wires )

I have read that koef3 is working on a test on the new SST-20 led so I skip that one, but I did want to know the behaviour of the even newer 95CRI 3000K version of the SST-20 for a flashlight build I want to do, so I did a voltage/output test and might as well tell the world.

It is the Luminus SST-20-W30H-A120, and I bought it from Kaidomain.

A datasheet can be found here.

The test was done like all my more recent emitter tests. I described it in detail in my XP-L test. , with two minor differences that should not matter significantly for the results: I used my Integrating sphere no. II instead of no. I, and for the current I used a clamp meter, which appears to measure 0.1A lower than the power supply current-reading that I used before.

In summary: 1) just one led was tested, reflowed on a 16 DTP copper board, 2) I used my large version II integrating sphere with high quality luxmeter, 3) the output numbers and voltages were measured with the led close to 'steady state' for each current, so warmed up and settled, you should be able to get these numbers in a well heatsinked flashlight. Mind that these are output numbers of the bare led, in a flashlight there will be losses from light obstructions, lens and optic, 4) output is in 'djozz-lumen' defined as 1/550 of the output of my Sunwayman D40A on high setting, which I hope is close to the real lumen (recent comparisons show that it is actually between 7 and 11% high), but at least is consistent over all my emitter tests done in integrating spheres.

The graph:

Some observations from the graph:

*I put some other high CRI 3535 leds with comparable die size in the graph, I would have liked to add a high CRI 219C but I have never tested one myself so I would have had to transport data from TA for that (his test of the 4000K 92CRI 219C showed 800 lumen at 3A which would be a better output as this SST-20 but at a bit lower CRI). And I added a XP-G2 S4 2B to show how much output you sacrifice when you go high CRI.

*Output and voltage matches very closely that of the 2nd gen. 90CRI 4000K Oslon Square, which is pretty good for a 3000K 95CRI led: low-ish voltage, good output, can handle pretty high current,

*It died from burnt bond wires at 7A

The tint seems wonderful, nice and rosy, but I need to reflow a new led to actually measure that.

......

(30 minutes later), I did a new reflow and did one quick light quality measurement of the bare led at 350mA, from straight above the led. Not as comprehensive as maukka's reports, but here are some screen pictures of the spectrometer:

So the rosiness that I observed is definitely there! And the CRI is there as well. Both a high R9 and R12. This is one nice led!

(and now this led in SST-40 package as well please)

Edit July 29th: some more CRI data of this led as build into a Convoy S9 can be found in post #15, also a pretty beamshot can be found there.

Edit August 6: some more CRI data of this led as built into a Jaxman E2L with Carclo triple TIR optic can be found in post #35.

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Thanks :+1:

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Wow this emitter looks amazing! The CRI performance is even better than the E21A and 219B 9080. I was looking for a 2700k or 3000k 219B 9080 for a while but this seems to be an even better emitter. Higher CRI, brighter and more efficient, and even better tint. I calculated a duv of –0.0056, which means it is as rosy or rosier than the E21A. Thanks for posting these results!

Do you have any beamshots by any chance?

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nice test!
I wonder how this compares to the new Samsung LH351 3000K high CRI series?

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About as efficient as a 3000k LH351B 90+CRI in terms of lumen output.

Less efficient than a 3000k LH351D 90+CRI though, since it has a smaller die.

All in all, it looks like to be a wonderful LED.

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Has anyone done any testing on the 3000k LH351D 90+CRI?

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Strangely enough, not at all.

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Thanks for sharing your results!

I have a few of these on there way to me from KD already.

This might have made a nice choice when the poll for the FW3 emitter was being taken.

I have more high CRI emitters than I know what to do with right now. My LH351D’s from the group buy came earlier this week, my order from 219Bs from that group buy came a few days later, and I already had more 80+ and 90+ nichias from Mtn that I had plans for.

And then there are the 9 70+ SST-20s, and roughly as many SST-40s.

I think I need to order some triple emitter hosts from Jaxman and Sofirn. That’ll be a good start…

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Thanks! I would appreciate the lm/Vf data in a number format as well :wink:

Is this the led you purchased? http://kaidomain.com/Luminus-SST-20-J3-HD2-Warm-White-3000K-LED-Emitter

At least the part number on the package matches yours, but their other info can’t always be trusted.

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djozz, please give a link for this LED.

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Thnx Djozz! Nice numbers and was looking for some 3kK emitters. Ordered some to try.

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That is the correct link, Kaidomain left out the CRI number in the description.

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Nice! :sunglasses: :+1:

Thanks for testing!

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Thanks for the hard work mate. How does your standard SST-20 perform are they any good?

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I have built a Convoy S9 shorty with this led. Current 160mA/880mA/1.85A, output on high 350 lumen. That makes the efficiency of this flashlight on highest setting about 50 lm/W which is not bad for a light this warm and high CRI.

Important for the performance of this high CRI SST-20 is how the beam looks like and how the tint/CRI is affected by the (OP-)reflector and lens (the lens of the S9 does not seem to be AR coated, which is nice for very high CRI builds)

The beam is a beauty, I say 219B-quality:

The light quality in the hotspot:

The light quality halfway the spill:

So compared to the bare led, in such a build you loose a small bit of CRI and the rosiness is a bit less, in fact the hotspot ended up almost on top of the Black Body Line. If you really want to retain the rosiness of the bare led you need to use this led in an aspheric lens flashlight.

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That looks great with only a little tint shift. I also briefly tested the cool white SST-20 and the beam looked nice and even cool white with a S2+ sized OP reflector.

edit: I like how the Gossen tells you all the important details right on the screen!

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I’m sorry for not showing the IES TM-30-15 data, this way of capturing the limited CRI data from screen is quick for me :innocent: and already shows a lot of what is going on.

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So do I, because of my lack of knowledge and interest in computers and automation, led testing and doing the write-up is a quite tedious job for me, at least the new addition of some tint/CRI information is very quick this way.

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Are you saying that you’re not paid for spending hours doing this??

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Not yet that i know, of I have four of the LH351B 3000K high CRI LEDs in a lantern prototype for testing, but have not got any of the LH351D series yet. These SST-20 3000K seems to be a good LED to test too.