Samsung LH351D color testing

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maukka
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Samsung LH351D color testing

Kiriba-ru sent me a Samsung LH351D for testing.

The emitter tested is a model number SPHWHTL3DA0CF2R1W2 with 5000K, CRI70 and rated luminous flux of 460lm at 1050mA. It fits on a XP/219/319 MCPCB. Now I’d like to test the higher CRI options, which are also plentiful.

I tested it with the small OP reflector from the Reylight Pineapple. It was sitting on an MCPCB, so no heatsinking and no stress testing at high amps. I’ll put it later in some light

Visually I’d rate it close to the Nichia 219C 5000K R8000. Very nice and neutral white tint (4900K, duv 0.002), no bad sudden tint shifts, rings or discolorations in the beam, mostly a big pure white hotspot that fades quickly. Just a bit cooler on the outer edge. The warmer/yellower corona is not very noticeable, much better than on the new Crees.

Tint with output current of 100-1000mA

Tint in different parts of the beam

CRI data on rated current of 1050mA

Edited by: maukka on 11/29/2017 - 14:33
maukka
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On the other hand, it doesn’t play nice with a big SMO reflector from the Eagle Eye X7. Wide and very visibly green corona around the nice hotspot.

kiriba-ru
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Texas_Ace should get a couple of same leds in a week. I would like to see dead test. I know they are good under 1A (better than XP-G3?) but probably far away over 5A.

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maukka
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Got some LH351D 5000K CRI90 emitters (SPHWHTL3DA0GF4RTS6 from digikey) and they’re really good as well. I put them in a Wuben TO10R triple with a clear Carclo. There’s just a hint of green on the highest mode, but I wouldn’t complain. Thanks to the smooth and evenly tinted beam, it’s easy to correct with a filter if you’re going to run these very hard.

CRI and tint data in ascending current order.

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Nice test! Thanks! Thumbs Up

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djozz
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Thanks, those are great tests to evaluate how good these leds are!

link to djozz tests 

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Output in a sphere. Strange that the output tapers off at 6A while in TA’s test on the CRI70 version went much higher. Maybe my reflow wasn’t perfect. At least the performance up to 4A is very good.

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Thanks for the test, indeed 1200 lumen at 4A is really good.
Strange things sometimes happen with led tests. I have done tests on the XHP70.2 that have a maximum at much lower current than TA and Koef3, I blamed that on for my (for that immense power) insufficiently cooled ledmount, but it could have been something else too, I never really found out. Perhaps in your case the thicker phosfor layer which also has a different composition is to blame.

link to djozz tests 

“I used to think that top environmental problems were biodiversity loss, ecosystem collapse and climate change. I thought that thirty years of good science could address these problems. I was wrong. The top environmental problems are selfishness, greed and apathy, and to deal with these we need a cultural and spiritual transformation. And we scientists don’t know how to do that.”   (Gus Speth)

MascaratumB
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Quote:
There’s just a hint of green on the highest mode, but I wouldn’t complain.

I don’t know if it is a “fair” comparison, but how are these comparable to the XP-G3 5000K 90CRI used in the Wuben flashlights? Are they less green or so-so?

Thanks in advance!

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My review of the TO10R and TO46R: http://budgetlightforum.com/node/60934

With the XP-G3 the center of the spot might be fine, but the tint is all over the place and severely green on the edges. This can be remedied with d-c-fix and a minus green filter. The LH351D is much better out of the box. You don’t lose output but throw does decrease, larger emitter area = larger spot.

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maukka wrote:
My review of the TO10R and TO46R: http://budgetlightforum.com/node/60934

With the XP-G3 the center of the spot might be fine, but the tint is all over the place and severely green on the edges. This can be remedied with d-c-fix and a minus green filter. The LH351D is much better out of the box. You don’t lose output but throw does decrease, larger emitter area = larger spot.

Thanks for the answer maukka! I have DC-Fix on my TO46R due to those shifts of the XP-G3 (even if they are better than the CW 70CRI from the stock lights). The DC-Fix did help to improve a lot. And that was the reason I was asking, to check if this would be less green. And you confirm! Thumbs Up

This said, I am still fascinated by the 4000K one you’ve shown above in comparison Blushing
Let’s see if the FW3A will have it Cool

REVIEWS : Amutorch S3 /  AM S3 vs Neal 219c  /  Amutorch AM30 / Nitefox UT20 / Sofirn SF14 & SP10A / Sofirn SP32A / Sofirn SP10B / Odepro KL52 / Acebeam H20 / SS AAA / Wuben TO10R / BlitzWolf BW-ET1 / Odepro B018 / DQG Slim Ti / XTAR PB2 Charger / Nitefox ES10K / Nitefox K3 / Amutorch AX1 / Amutorch VG10 / Olight M2R Warrior   

Mods and tricks: 1 / 2 / 3 / 4 / 5 / 6 / 7     Convoy S2+ TIR Lenses: XML2 / XPL-HI     Others: Convoy S2+ Mini (Biscotti 3 & 1*7135)     Sofirn K6 Discussion: 1 / 2 / 3    Triple TIR & XP-G2                   MY GIVEAWAY (FW3A) = ACTIVE

DB Custom said: "Hide your billfold, cut up your credit cards... you're a perfect candidate for full blown flashaholism and will soon need dedicated flashlight cabinets. [...] Have fun! Modding is next... :P" 

 

maukka
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djozz wrote:
Thanks for the test, indeed 1200 lumen at 4A is really good. Strange things sometimes happen with led tests. I have done tests on the XHP70.2 that have a maximum at much lower current than TA and Koef3, I blamed that on for my (for that immense power) insufficiently cooled ledmount, but it could have been something else too, I never really found out. Perhaps in your case the thicker phosfor layer which also has a different composition is to blame.

CRI70 version of the LH351D topped off at about 6 amps with two different heatsinks and fans. The heatsink shouldn’t be to blame since I also tested an XP-L2 CRI70 and it went nicely all the way up to 10A with more output and better efficacy than in TA’s test. No idea about the binning of my sample since it came from Kaidomain. Could also be the nondescript MCPCB I used for the Samsungs. Kaidomain Cu DTP for the XP-L2.