LH351D 90CRI Spectrum Tests

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thefreeman
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Sari33 wrote:
Does dedome lh351d decrease even more the CCT and also blue peak than slicing? Would be interest on stock 2700k

Results here :
https://budgetlightforum.com/comment/1699687#comment-1699687

Sari33
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thefreeman wrote:
Sari33 wrote:
Does dedome lh351d decrease even more the CCT and also blue peak than slicing? Would be interest on stock 2700k

Results here :
https://budgetlightforum.com/comment/1699687#comment-1699687


Great
Have you tried measure spectrum at very low current like 1~3mA?
My sample at these current look much more greenish and bluish compared to 0.1A you measured,I guess Duv and blue light increase much more.
Does that will happen less with lower power Leds like E21A or the ones used for strip lights?
Bob_McBob
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The current stock of SPHWHTL3DA0GF4RTS6 (dog farts) at Arrow is the worst batch of LH351D I’ve ever come across. Duv ~0.0065 at both low and high current, and CRI doesn’t even reach the rated 90. At 3A they’re something like CRI 87.5 with an R9 of 40. Even slicing them down to the phosphor still gives a significant positive Duv and sub-90 CRI. Utterly atrocious Facepalm

mbp
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Bob_McBob wrote:
The current stock of SPHWHTL3DA0GF4RTS6 (dog farts) at Arrow is the worst batch of LH351D I’ve ever come across. Duv ~0.0065 at both low and high current, and CRI doesn’t even reach the rated 90. At 3A they’re something like CRI 87.5 with an R9 of 40. Even slicing them down to the phosphor still gives a significant positive Duv and sub-90 CRI. Utterly atrocious Facepalm

With the new Nichia 519A R9080 having similar performance, perhaps LH351D will fall by the wayside like 219C did.

JaredM
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Hmm. Didn’t think of that. Maybe 519 can replace the samsung, but we’ll have to wait for tests. The newest Nichias don’t overdrive much if any, so it’ll need a big die. EDIT: The 519 has a 4mm die. The 351d has a 5mm die.

2.4A is their max pulse current. This is actually the same spec as the 219F which is a 2mm die. ‘Continuous’ rating is up from 1800mA to 2200mA. If they behave proportional to spec, then about 4.9A will be max current before the phosphor burns up. Will that be enough to beat the Samsung? That’s the question. Maybe we could see 2500lm (djozz calibration) from a 5000K 70CRI variant

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