LH351D 4000K 90cri group buy.

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Barkuti
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That LH351B looks quite good too imho. According to datasheet its flux bin can be F1 (90 - 100lm), G1 (100 - 110lm) or H1 (110 - 120lm). Which one is it?  This translates into 297 - 330, 330 - 363 and 363 - 396 lumen ranges at maximum specified driving current (1.5A, 3.3x multiplier). If dedomed should be perfect for throwy small flashlights with high quality output.

By the way, do these (LH351B/D) feature bond wires? I'll try super fine grit sandpaper dedoming with them. 

 

Cheers 

djozz
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I swapped the led in a Sofirn SP33 for the 4000K 90+CRI Samsung LH351D, and I’m in love with this led. Texas Ace already showed with a 5000K low CRI version that this led has great output and can handle a lot of current, I can confirm what maukka found: this 4000K 90 CRI version has a very good tint (and colour rendering of course), and it behaves absolutely fine in a smooth reflector.

So I swapped the led, I bypassed some springs and fiddled with the current sense resistors, and now my SP33 puts out 950 lumen OTF at 3.8A current, which is quite an achievement with light of this quality.

I’m almost convinced to swap these leds into my Q8.

Edit: interested in 10 more Smile

CRX
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Interested in five of these.

AEDe
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Barkuti wrote:

That LH351B looks quite good too imho. According to datasheet its flux bin can be F1 (90 – 100lm), G1 (100 – 110lm) or H1 (110 – 120lm). Which one is it?


D2VAH1 2.6-2.8V , Bin H1 ,tint VA
mrheosuper
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i would like 10 of these, thanks

Forgot my pen

AEDe
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List updated.

maukka
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I’ll take 10 more as well.

doubleone44
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Interested in atleast 5

khas
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Interested in 6 LED’s.

Thanks for doing this Thumbs Up

HarleyQuin
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I’ll take 10.
A very nice offer, thank you.
And thanks for all of you who went through testing these LEDs. Beer

@AEDe, as I’m a paypal-noob you need to tell me the exact sum I have to transfer. I have no idea how much paypal fees add to which kind of transaction.

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charles lin
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Interested in 9

bunnicula
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I’ll take 10, thanks!

gisewhcs
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I’m interested in ten of those Leds, too.
Thanks for your effort in making these available for cheap!

The_Driver
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Lol, now the orders are flooding in Big Smile

prisma
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10 pcs for me please

AEDe
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HarleyQuin wrote:

@AEDe, as I’m a paypal-noob you need to tell me the exact sum I have to transfer. I have no idea how much paypal fees add to which kind of transaction.

The simple way is to choose “send to friends…” or something like this.

List updated.

Barkuti
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What is the LH351B's die size? Did I read somewhere it is barely bigger than that of XP-E leds?    

 

Cheers Smile

 

The_Driver
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Barkuti wrote:

What is the LH351B’s die size? Did I read somewhere it is barely bigger than that of XP-E leds?    

AEDe posted a pic of them. The LH351B is XP-G2 sized.

djozz
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Here is some random leds from my discard box. You can find nice size comparisons in CRX's Leds 'n Stuff thread too, but this gave me something fun to do Smile . The real die sizes will be viewed enlarged for the leds with dome, but that is how the optic will see the led as well so what you see is the relevant size, well, sort of undecided

row1

Cree XHP35

Cree XHP50

Cree XHP70

row2

Cree XP-E2

Cree XP-G2

Cree XP-L

Cree XP-L Hi

Cree XM-L2

row3

Osram Oslon Square 2nd gen.

Osram Oslon Black Flat

Samsung LH351B

Samsung LH351D

LG H35F0

row4

Nichia 219B

Nichia 144A

Barkuti
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The_Driver
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Thanks djozz!

The Samsung LH351D actually seems to have a larger die than the Cree XP-L.

ImA4Wheelr
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I'd like 24 please.  Thank you for arranging this.

s1m888
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10 for me please. Thanks.

mrheosuper
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how many lumens will i gain it i Direct Drive it with sony vtc5a or samsung 30Q, i hope i can get over 1500

Forgot my pen

bunnicula
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The_Driver wrote:
Lol, now the orders are flooding in Big Smile

I wouldn’t have known about this group-buy if maukka hadn’t mention the emitter in the Wuben group-buy page.

Andrey, please add 10 more for me. Thanks.

AEDe
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I did not expect such an increase in interest in 351D.)
But there is a problem. It is not possible to withdraw $ from PP , in Russia. Añd I don’t need so many $, on PP. So I should use PP currency exchange. It resulted in price increase.

This does not apply to those who have already written in the list.
The first 170pcs has the same price. After that price will be 1.7$(1.6$ for 20pcs+) and 5.20 registered post.

Sledgestone
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Interested in 20

How does these compare to Nichia 4000k 219c in tint? Less green?

bunnicula
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Sledgestone wrote:
Interested in 20

How does these compare to Nichia 4000k 219c in tint? Less green?

http://budgetlightforum.com/comment/1303781#comment-1303781

From maukka’s measurements:

Duv=0.036 Nichia 219C sm403 @ 700mA

Duv=0.018 Samsung LH351D 4000K @ 1000mA

Barkuti
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Did maukka's test hijacked this thread? Flat Stare

AEDe wrote:
… So I should use PP currency exchange. It resulted in price increase.

This does not apply to those who have already written in the list.
The first 170pcs has the same price. After that price will be 1.7$(1.6$ for 20pcs+) and 5.20 registered post.

And now the last one to the house is a rotten egg? @#$%! Sorry, don't mean to be gross but hadn't yet decided how many. :-/

Can you take €uro bank transfer AEDe? Big Smile LoL!

Grrr 16pcs for the LH351D. I'll add some LH351B units later.

 

Cheers 

djozz
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The price is still very good Smile

I found out over the last years that knowing that a certain led exists is just the beginning, finding them for sale is often very difficult, especially if you want a specific tint or bin. I’m happy that this specific nice led is made available for the humble flashoholic. Smile

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