Watching this one, I am a huge fan of 4000k and an even bigger fan of the 219b R9080 sw40 and sw45.
Wow! Thank you for doing this.
Subbed!
Thanks for doing this! For me the best quality of the LH351D is how good it just looks to the eye (plus efficiency of course). Not 219b good, but miles better than SST20 or CRI90 219C regardless of CCT and duv. LH351D is fine even a bit above BBL, just like the venerable 219C 5000K CRI80.
SPHWHTL3DA0GF4RTS6 (5000K)
Am I the only one that reads this really quickly and thinks āDOG FARTSā? Iāll see myself out now, thanks.
No 
https://www.reddit.com/r/flashlight/comments/98yk8c/highcri_samsung_leds_now_available_from_arrow/
hahaha!
This is probably not the final format but iām going to try to refine it a bit before I test every LED. Feedback welcome if you see something missing.
The goal of my testing is to figure out what LEDs are worth checking out and which ones should just be avoided. Iām not trying to take loads of beam shots or do death tests on the emitters, there is enough of that info out there.
I limited the measurements to the hot spot because these LEDs generally have an even beam, I assume thatās OK.
I can include voltage at each current if itās helpful. I chose 5 currents (100mA, 300mA, 600mA, 1.0A, 1.5A). Seems like a good mix to me but open to feedback.
Hereās the lower flux binned 5K 90CRI (the small dog fart if you will):
I may need to come up with a good way to line up the S2+ SMO cause it looks like I have an outlier. In any case the Duv was a bit high with it as expected. The TIRās were both pretty acceptable but without the other bins measured I wont make any final conclusions yet.
This CCT was between ~4750-4950K so on the ālowerā half of the 5K bins. CRI was between 91-93 (R9 54-67) depending on current and lens. Lower current = higher CRI and Frosted Carclo also gave the higher end of the readings with SMO reflector giving the lower end.
I really like the LH351D. My favorite domed is the 4000K 90cri that I purchased from arrow. The real magic happens for me, when then dome is sliced.
I sliced a 4000k for the first time a few days ago and I was really impressed with the tint. My favorite led was the 5000k 90cri sliced, also purchased from arrow.
But now Iām starting to lean more towards the sliced 4000k.
I like the higher light output of the LH351D, even sliced it still makes a very decent amount of lumens. I modded a TCR1 with a triple LH351D sliced 5000k 90cri with a KD optic and it made 1022 lumens OTF with the lens installed over the optic.
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Thanks for doing this Contactcr, I would be interest in seeing the results with the domed sliced also.
Did I miss Arrow carrying 4K 90CRI? I donāt remember them ever stocking small quantities.
Iāll post some results for shaved 4K, only done those on one so far but probably a dozen or more 5K and they all turned out great.
Any specific one you want to see shaved?
They carried both a good bin of the 4K 90CRI AFAIK, and definitely the āDogfartsā as I ordered some from them.
Oops, I was mistaken. The first 4000kās I purchased were from AEDe, then a second batch from AEDe, then a third batch from Digi-key which I havenāt used yet.
My mistake. I got several of 5000kās from arrow when they were $0.74. I liked the 4000k better because the 5000k looked to white to me. But dedomed is a different story, I like the tint.
Dedomed testing on the 4000k would be interesting, thatās the only two color temps I use anyway. 
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Kind of off topic for this thread, but I was curious if anyone had dedomed or tested a dedomed a 219b SW45K?
I keep thinking I ordered some 4000k from arrow but I went back and checked and I order twice from AEDe and once recently from Digi-key.
I logged in at arrow to check my order history (which I have placed many orders) but it said I didnāt have any order history. 
This was from a few nights ago, the first time slicing a 4K for me. Itās the TPQ6 from DigiKey that is (spoiler alert) not that great compared to AEDe 1st batch. I never sliced a 4K before now because the AEDe 1st batch was too nice by itself. I still need to test it formally like the above but in an actual S2+ SMO with AR lens (which both tend to increase Duv) it is spot on BBL and a little under with FET modes, around ~3500K CCT in hot spot. Once I test with no glass and try the TIRs I suspect it will be even better. To be continuedā¦
Love the LH351D High CRI series. its like having the high CRI abilities & tints of the past Nicha 219, but with much more deficiency & output capability of a XP-L.
Nice beheading job contactcr .
LH351D has always been far too floody for my tastes. Maybe theyād pair better with larger optics like on the D4S. I also notice the better red rendering of the SS20 compared to the LH351D though. FA3 binned SST20 is especially amazing. Too bad luminus chips vary their tint greatly depending on current.
Great thread contractcr!
Following
Pardon my ignoranceā¦ but who is AEDe? I assume that there are none of the āgoodā 4000k floating around out there? I really prefer at or below the bbl and 4000k.
AEDe organized a group buy of <1,000 pcs from a Russian vendor ( https://e-neon.ru ) I reached out to him again because I see they have a 4K 90CRI bin in stock but no response yet. If someone in that part of the world can get the chromacity bin info it would be nice. I was holding out for AEDe to reply so I have not yet tried to contact the vendor.
edit; I guess I should also set your expectations. I suspect none of these will be so far under the BBL like a 219B. I personally prefer LEDs very close to the BBL and do not particularly care if itās slightly under or over. I would guess most manufacturers would think a sw45k like LED to be out of spec.