Luminus SST-20-W 4000 K CRI95 color and output test

Flashlight Modding and DIY Parts
6

Thank you for this thorough measurement :+1:

There seems to be a noticeable drop in the cyan and cobalt blue area of the spectrum - but the high R12 value is still very impressive - and R9 is nearly at Nichia E21A level.

How this LED compares to Nichia 219C and Samsung LH351D high CRI offerings with the same CCT in regards of tint shift, output, and Vf?

Do all of these Yajiamei optics consistently push CCT into warmer direction, and a bit above BBL (this latter is no problem for me)?

I was very happy for a brief moment, when I read your bare emitter CCT measurement (43…K), so I wonder, if there are TIR optics available, which don’t - or just marginally alter CCT.

7

Yep. It’s very efficient. About on par as other small die 4000k 90+CRI LEDs, with a lower forward voltage.

This would make a very nice LED array in a 6A LD-A4 Sofirn C8F build. It would be gorgeous.

8

Back a few months, I ‘snapped’ two C8F hosts for a very good price, but I was hesitating to put Nichia 219C in those hosts because the rather low Vf - I guess, this LED will be a good choice for triplets or quads.

9

The difference is not great but this SST-20 starts getting a slightly higher voltage than the 219C, when going over 3A, so yes it will draw a bit less current and heat in high current direct drive triples or quads.

10

Thanks for the test!
It’s certainly an interesting LED. The light quality is very high and the efficiency thus low. It’s advantages over other LEDs with high-light quality are the XP solder pad layout, the single-die design (compared to the Luxeon MZ) and that it tolerates high currents (compared to the Nichia E21A and 219B-V1).

11

So…. where to get a 5k low cri version to dedome….?
Could that be a XP-G2 killer?

12

http://kaidomain.com/Flashlight-DIY-and-Tools/Luminus-SST-20-L3-DA-Neutral-White-5000K-LED-Emitter?sort=p.date_available&order=DESC

13

The dedoming will be the challenge, no leds dedome so nicely as the old-school Cree’s

14

Thanks Djozz.
I’ve been away from BLF for some months, so i have some catching up to do. :slight_smile:

Yeah, i bought 1 Liter of 99.5% Toluene for those SST’s, still a challenge though, but i’ll get some anyway.
I’ve still got a B158 waiting for a high intensity LED, for example.

I’ll try some of these high CRI ones too.

15

Slicing is the way to go with SST…
Now I’m impatient to get mines, they will go straight in the D4 :-p

16

Amazing testing maukka. Thanks.

17

Thanks for this test :+1:

18


Does nobody else see the burned place under the top bond wire? Is that just a slightly darker connection area? Was it that dark before the test?

19

There’s the before image at the top of the OP.

20

Thanks Maukka, Im always interested to see your reviews. This one would have been the perfect 219b replacement if the tint bin was below tbe bbl.

21

I tried dedoming (chemical way) two of this leds, it did not go well :confused:

22

Any thoughts on how these would compare to the stock emitter options in a D4s? I have the Nicha version, but I’d like either more throw, more output, or some combination of both. It doesn’t seem like these would give me much, if any more output than the Nichia and the XP-G2, but are they more intense than the Nichia? They are certainly higher CRI than the XP-G2s.

23

The difference in performance with a 219C R9050 will not be great. The CRI is better though, comparable to a N. R9080, which is not available in 219C, only in the lower performing 219B.

24

What did you use?

25

I intend to try when my 5000k come in from Kaidomain. I ordered 10 and I’m willing to waste some to see if it’s possible with Aerosolve II. If that doesn’t work I have some other solvents. I really want to see what this little guy can throw at 5 amps.