Next on stage... ... ... Rita Fang and the Alibaba QBs!

Rocket Soul said:

Are you completely sure that a visible black dot/zenner diode is smoking gun proof of the diodes arent S6? That means that noone could show a black dot diode in a strip from digikey and since we got plenty of people here using them it shouldnt be too hard to get them to check. As far as i know the black dot test comes from here in the led section and is based on visual inspection of a mere handfull of diodes.

Also, if they are S5 are you sure the switch is made by Meijiu/rita or if it is their supplier selling them as S6 rather than S5?


Theres ways of discerning lm561c from b without looking for dots. The yellow bit in the middle of the orange phosphor looks slightly different, smaller in lm561c if i remember right.

And why do you care so much if they are s6 or s5? They both do the work and if you can get 2 (or even 3!) boards at the price of one S6 id say youre still getting ahead.

This whole situation is to be expected when you buy direct from china; not being able to ascertain bin without some hefty and expensive tests with literally no support from the seller.

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coreywebster said:

Will cobkits test them for you?
Didn't he test vegas winners back in the day?

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ChiefRunningPhist said:

When I make the sale contingent upon them being S6 it makes a difference to me...
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I agree there isn't much difference in performance, but then just tell me they're S5.

And agree also that if it's S5 that it could be a swap outside of Ritas control but she scolded me and tried to act like I was crazy for asking about them. Then won't sell me another so I can test? How do you defend that?

We all know theyre not S6 so why try to shove that at people. Would like to know the components in the circuit. I don't think that's to much to ask.

Or maybe they are S6 and I'm a huge ass lol but I won't know until they're tested. Which ill be refunded for 10x over if they aren't so that's an $1800 upside to testing as well as putting the whole debate to rest. Or at least giving some real data to the community.

If @CobKits already tested them I missed it. Maybe he can tell me how big an ass I am haha

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ChiefRunningPhist said:

What were those results? Any visible ESD s6's?

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Ryante55 said:

Sounds like you should be buying from hlg if you care that much...you made a stupid choice own up to it an stop crying it's funny you want people that sell lights to test stuff for you so you can buy from someone else.

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coreywebster said:

There were some threads about the visible difference.
The tests done previous were on boards from other Chinese companies. Not where you got yours, but point was ask cobby to test them. Then you know.
@Randomblame might remember more about the visible difference

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ChiefRunningPhist said:

Hey doosh idgaf who tests them. If you bought 91 but they put 85 in your car you'd be pissed.

If I bought s6 from HLG and they were s5 I'd want them tested, applehead.

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ChiefRunningPhist said:

Hey doosh idgaf who tests them. If you bought 91 but they put 85 in your car you'd be pissed.

If I bought s6 from HLG and they were s5 I'd want them tested, applehead.

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Ryante55 said:

So you want them tested no matter what but you don't want to spend time or money testing them? Haha she didn't sell you any because your not worth the time. Oh and when multiple people tell you it's not s6 that's not good enough you need more reasons haha what a joke you are. BTW have you ever grown before?

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ChiefRunningPhist said:

Are you retarded? I said I'd pay to have them tested! I say God bless your parents for not killing you off boy. You some kinda special. If I was pissing on your leg and told you it was raining you'd be pissed too, so would I, the amount of the money is secondary...

What's this that's not good enough? Jesus your dumb, I have to have a test to get money back. Also would like to supply some data to the community.

Don't talk to me till your balls drop

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Ryante55 said:

Wow... ...Good luck on your first grow.

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Prawn Connery said:

First step, download the LM561C and LM561B+ datasheets.

Second step, measure your diodes with a micrometer or vernier scale to ensure they are the same as spec.

Third step, fire up the boards and measure voltage and current to the board.

Here's a tip: LM561C and LM561B+ are actually the same diode. Yes, you read that correctly.

When Samsung - or any other manufacturer - casts a LED, there are tolerances associated with the manufacturing process. Small variations lead to different Flux outputs and different voltage drops for the same current. The LM561B+ is in fact an LM561C but with a higher voltage drop - which makes it a less efficient (and hence less desirable and cheaper) LED. One is rated at 200mA (LM561C) and the other at 180mA (LM561B+) for this reason.

You cannot tell the difference by looking at them physically. Don't believe me?

Look at the spec sheets and point out the differences in physical dimensions. There are none.

Now look at the same spec sheets and point out the differences in Flux bins. There are none. (Actually there are, but only in 2700K.)

Now look at the same spec sheets and point out the differences in voltage bins. BINGO!

Now go back and test your boards and if the voltage drop is higher than the LM561C AZ voltage bin, it is an LM561B+ . . . or is it?



LM561B+ also has an AZ voltage bin. And an A1 (same as LM561C).

Fact is, they are the same LED divided into different batches and given different name codes.

First cut - those within tolerance - are LM561C, and within that designation are different Flux, colour and voltage bins.

Second cut - those mostly out of LM561C tolerance - are labelled LM561B+, and within that designation are different Flux, colour and voltage bins of equal or lower quality or efficiency compared to the above.

Some LM561B+ will just just as efficient as some LM561C LEDs. But the best B+s won't be as good as the best Cs, and on the whole (average) the B+s will be lower efficiency than the Cs - which is reflected in the forward voltage specs.

The bottom line is, if they have a higher voltage drop - which you can test yourself using a multimeter - they are likely LM561B+. But the only way to know if they are S6 or lower is to sphere test them.

Now go back to Rita and show her all this and tell her you work for Samsung

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The only thing is I've been advised there's low voltage b's & b+'s???

I too noticed the 180mA vs 200mA in the data sheets when I looked them over.

I told her I was an engineer.