LH351D 90CRI Spectrum Tests

jon_slider · 2020-05-26T03:52:21.000Z

buck91:

I’d really like to keep this as bright as possible and the 319 is doing alright for now… just love my high cri options!

I think you might have a 319a D340, if thats true, and you go to a sw45k D220… you would see a 35% lower output… sounds like you might not like that… but

let me play CRI advocate…
say your light makes 340 lumens now
and with a sw45k, lets say it “only” makes 220 lumens

the low CRI is only 54% brighter… that is not really a big visual difference
and you give up all Red rendering… to get those extra 120 lumens… is it worth it?

you know best…

lucky for you, that version of the quark is not glued… tinker on!

BurningPlayd0h · 2020-05-26T22:08:38.000Z

BlueSwordM:

It’s actually bigger on the LES vs the XP-L die.

Sorry, that’s what I meant unless XM-L2 LES is same size as XP-L? I only assumed larger due to the pad.

jon_slider · 2020-07-21T02:06:22.000Z

HDS has adopted the LH351d 5000k as its next High CRI offering.

It produces 300 lumens in an HDS
the sw45k produces 200 lumens in an HDS

so the LH351d is 50% brighter than the sw45k
equivalent to one hop on the HDS dial.

the LH351d is a 9050 LED with tint above the BBL
the sw45k is a 9080 (more red), with tint below the BBL

contactcr · 2020-07-21T02:29:34.000Z

The Samsung LED still has better cri and r9 than the natural light coming in my office today:

Two measurements taken in Texas, today at 2:45PM, overcast day. First is indoors with no artificial light, only ambient light from window - the next measurement is when I step outside.

jon_slider · 2020-07-21T02:57:02.000Z

contactcr:

outside
…

like of your anDroid ColorMeter app :+1:

contactcr:

The Samsung LED still has better cri and r9 than the natural light coming in my office today

good time for a dogfart :person_facepalming:

can you also show the ColorMeter data screen for the LH351d 5000k please?

contactcr · 2020-08-01T03:47:36.000Z

Here is the Sofirn sourced 2700K LH351D

Very similar to the DigiKey one I tested but with a better price.

1Amp with Frosted TIR:

Sari33 · 2020-08-01T16:06:23.000Z

contactcr:

Here is the Sofirn sourced 2700K LH351D

Very similar to the DigiKey one I tested but with a better price.

1Amp with Frosted TIR:

Would be interesting measure after slicing for know if DUV and CCT decrease at very low current.Cheers

contactcr · 2020-08-01T17:43:11.000Z

Sari33:

contactcr:

Here is the Sofirn sourced 2700K LH351D

Very similar to the DigiKey one I tested but with a better price.

1Amp with Frosted TIR:

Would be interesting measure after slicing for know if DUV and CCT decrease at very low current.Cheers

Here it is sliced in a Sofirn C01S AAA small TIR on the “100 lumen” setting. Not exactly apples to apples but you can see lower DUV but not much change in CCT. I cant explain why that is, maybe LED tint variation but probably just the optic doing strange things. It’s not really meant for such a large die. There is also a little ambient light in room.

thefreeman · 2020-08-03T14:53:02.000Z

I emailed Digikey the other day to ask about some color bins, I didn’t ask for a lot because I doubted they would reply, I got the reply today :

SPHWHTL3DA0GF4WPN6 (2700K) : 798 pcs F2 W7 N2
SPHWHTL3DA0GF4UPP6 (3500K) : 759 pcs F2 U7 Q2
SPHWHTL3DA0GF4TPQ6 (4000K) : 481 pcs F2 T6 Q2

Not sure how this info is valuable though because we don’t know if the bin you tested last year were the same.

contactcr · 2020-08-03T21:33:27.000Z

The 2700k and 3500k were always the best ones so I’m not too surprised by this.

We have seen T6 be above bbl from other vendors so it seems like these squares if meaningful generally tend to be at the very top of the square/bin

Side note; CONGRATS on getting one of these mega distributors to answer this. Didn’t think it was possible.

If I can muster up the energy I’ll test my Convoy sourced 5700K 351D tonight or tomorrow. Don’t think we have seen one of these in the “wild” yet. I think these were from some stadium lighting so I suspect mega green but we’ll see…

moderator007 · 2020-08-04T05:49:17.000Z

Thanks for all your testing contactcr.
My favorite is the 3500k UPP6 from digikey sliced.

thefreeman · 2020-08-04T11:01:10.000Z

contactcr:

The 2700k and 3500k were always the best ones so I’m not too surprised by this.

We have seen T6 be above bbl from other vendors so it seems like these squares if meaningful generally tend to be at the very top of the square/bin

Side note; CONGRATS on getting one of these mega distributors to answer this. Didn’t think it was possible.

Yeah, plus with 4000K and up the middle of the quadrangles is raised above the BBL, probably to merge with daylight tint (~ 0.0030 duv), on the other hand, integrated duv should be slightly lower than measured at the spot (but maybe not that much with the frosted TIR you used).

I was doubtful they would bother to check for me yes, I got no reply for ~10 days so I though they ignored me.

If I can muster up the energy I’ll test my Convoy sourced 5700K 351D tonight or tomorrow. Don’t think we have seen one of these in the “wild” yet. I think these were from some stadium lighting so I suspect mega green but we’ll see…

Simon wrote the bins he got and it’s Q2 (5700K) and R2 (5000K) so the lower duv bins. I have some 5000K coming (not interested in 5700K) so I’ll see how they test. By the way I measured my FC11 and it’s actually worse than yours :
5170K (Duv 0.0086)
(Ra) = 87.6 [ R9 = 30.8 ]

It’s quite strange, not 90 Ra and low R9.

contactcr · 2020-08-04T17:42:14.000Z

Convoy Sourced LH351D 5700K 90CRI (bin: V2Q2S1)

Frosted TIR, same as before. The results are about what I expected. I purchased these mostly for two reasons: slicing and tint mixing. For both purposes they should be acceptable.

1 Amp	2 Amp

DarkShot · 2020-08-04T19:02:57.000Z

Thanks for getting those tests done! No surprises there but at least some Lee filters could help with the slight green tint.

I’ve got some incoming to see what slicing will do. Hopefully it’ll produce similar results to sliced 5000k dogfarts.

id30209 · 2020-08-04T20:30:32.000Z

@contactr

Have you got a chance to grab KD’s 5700K emitters?

contactcr · 2020-08-04T21:55:44.000Z

id30209:

@contactr

Have you got a chance to grab KD’s 5700K emitters?

Nope, I can grab one though. Any other stuff at KD I should be getting?

id30209 · 2020-08-04T22:25:10.000Z

Actualy no. I was just curious how are their 5700K compared to the one you have. I had one installed in Novatac and it looks great. Not so “green and yellow”...

That’s why am puzzled.

contactcr · 2020-08-05T19:18:43.000Z

Here’s the Convoy 5700K sliced in Wurkkos FC11 (shallow light OP reflector, plain lens, on high):

Good for a day time use light since your eyes are adjusted to >5000K ambient above BBL light already.

id30209 · 2020-08-05T21:35:12.000Z

Not bad at all.

contactcr · 2020-08-15T16:05:56.000Z

If anyone is curious what these look like under a TIR with all the phosphor removed:

450nm and 25000K CCT (if that is even a thing, I guess it is technically.)