Samsung LH351C 5000 K CRI90 color and output test

Thanks a lot for the test maukka. Gonna practice dedoming these very soon.

Cheers :)) :CROWN:

Can someone recommend a small TIR with very wide spread. If possible a TIR without a visible spot.
Checking the options and prices. Want to build a light (like a lightbar with 6 or 9 LED´s) for kitchens wall cabinets (for my parents). So distance between light and worktable is less than ~60cm.

You don’t necessarily need any optics for that, just a milky/frosted piece of acrylic (or d-c-fix 346-0211 on clear). I really like the Yajiamei optics, and there’s a very large lineup of spotty and floody up to 85°.

Thanks Maukka!!!
They look nice and they are really cheap. I could bite my ass that i did not order more LED´s (0,30€/led) from Arrow (I only ordered 5 to play with).
But i will have to order some more. Hope to find another order option for the TIR´s. Because i have a problem with Aliexpress. Still working on a refund (after i already spend hour and hours with their support).

maukka - have you ever measured and compared a sliced one?
I did this with the 80 CRI version, I can only estimate but I’d say CCT went from 5000k to <4000k and the slight greenish hue looks gone now

I will have a look when I’m at home later, could very well be :slight_smile:

Why did The_Driver deleted his post?

No idea, btw I just checked and I do have some of those leds still.

:+1:

You are being nosy ;)

Maybe because I don't need any anymore. :)

Thanks, I already found some. :)

These LEDs are very efficient for their size, 90CRI and the possiblity of having a good tint together with high luminance (when shaved). In part this is achieved by a slightly lower R9 value when shaved.

Nah I'm not noisy, as a rule not even my farts are when needed (because ;-) ninja).

Aaah! You said nosy! :-D

I still have two, wonder what will do with 'em some day. Powered by an XHP70 boost driver a quadkenstein aspheric build sounds appealing to me, albeit one with just two emitters would also do by carefully adjusting the current output.

How did it go Barkuti?

Wellp, it didn't go. Can't recall what I was planning by the time but I used another emitter. They're still in my emitter cache box.

I see. I think this LED might have some potential for high CRI throwers. More efficient than SST-20. Also green but dedoming is said to fix that.
But maybe they aren’t so good, it’s hard to tell without knowing die size…or testing. :slight_smile:

Any lumen to candela measures done already. Is it more like nichia 219c or sst-20?

I took the picture above and measured die size. Magnified by the dome, about 2.2 mm side. Assuming refraction index of about 1.5 that would be very roughly 3.2 mm².
And it’s flip chip.
So…despite much higher efficiency than SST-20 it’s unlikely to compete….though I would still love to see it dedomed as I have no idea of how good or bad is the calculation method that I used above. :wink:

Well, I’m not sure if those will be a throwy ones…
I hoped those could have similar to xl-l hi beam pattern, but now I assume beam pattern should be more or less like nichia 219c.
219c is probably their main competitor which samsung’s should beat with similar light quality and better output.
SST-20 95CRI are still great leds that thanks to its high R9 do not have real competitors yet.
Look like lh351c have the same phosphor dice size as lh351b, but dome is same size as lh351d.

Just to reference here is a photo of LH351C next to SST-20 and XP-L HI.

Hotspot is quite big next to two others.

I can not see how these can be effectively dedomed, it looks like the phosfor is mixed with silicon, just like many other leds (i.e. all Nichia’s), so there is not a transition to a different material between silicon and phosfor area that has a weak adherence, like in the classic Cree’s.

But these can be sliced very effectively, if you are very good at it you can slice it up to a tiny bit into the phosfor layer, leaving a matt surface, just like a dedomed Cree, and I suspect with the same quality of photon recycling.

Thanks sungar. :slight_smile: