New style Samsung LM561C Board

chuckduck

chuckduck

Well-Known Member
Randomblame said:
For sure still better than HPS. The difference could be between 5-25lm/w less depending on the used binnings. But you can compensate it by a certain margin if you drive them a bit lower.
If you buy more boards, then only on the condition that he gives you a replacement for the fake boards or reimburses you a large part of the cost. He knows exactly what he did and the excuse is always the same, someone else is blame.
The bad part is that they get away with it 99 times and only one in a hundred realizes that he was cheated.
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Thanks for the thoughtful answers to my questions. Crazy how this panned out. It played on my personality perfectly. I'm pretty good at noticing bullshit but I got caught thinking I could just skip a step and get boards from the manufacturer. My love of a good deal and the fact I tend to trust people colored my bullshit detector. In the end I'll still have a decent light with good efficiency (I was planning on running it low anyway). In spite of all that's happened I do think I'm going to take a shot that the next ones he sends me, at a reduced cost, will be the C version. Can't shake "gotta get a deal" part of my personality.
Like I said thanks for the on topic answers. This will prove to be a valuable thread for many.
 
D

Dave455

Well-Known Member
legalcanada said:
yes i'm flowering under all 80CRI 4000k and am very happy with my results so far... big dense ass nugs and frosty too! had very little stretch during flip so that could be good or bad depending on preference i guess. maybe the results would be a little better with different diodes but i'm not complaining.
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Using any supplemental extra red or UV ?
 
legalcanada

legalcanada

Well-Known Member
what is your conclusion of this diode then? LM561B? C? Epistar?
chuckduck said:
For the sake of comparison, here is a pictureI just took of the diode from a Photon Fantom sunboard. Can we assume that they are authentic lm561c Samsung LEDs? I think we probably should. They look like the ones I have. So I'm not sure what the whole "dot" thing means for the real/fake debate.
View attachment 4059382
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graying.geek

graying.geek

Well-Known Member
Randomblame said:
Yeah, I should strap him to a chair and force him to read my entire post history, LOL!
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LOL, for sure. Jeezuz, some of these kids need to wait for their other testicle to drop before complaining that someone laughed when they dropped their ice cream cone. @Randomblame is among the most knowledgeable, helpful and non-asshole members of the forum. Attacking him for an LOL, is, well, petty and foolish.
 
legalcanada

legalcanada

Well-Known Member
Randomblame said:
That remains a mystery, LM561C looks different in any case. Not only the dot is different, there are also no visible gold wires and the rectangle is also slightly different.
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why can't i private message you. gold wires would be visble on LM561C? i just looked at my quantum boards and they are visibly different. no noticeable black dot

even LM561B and B+ on samsung website does not show a visible black dot so i'm not even sure if they could be them... actually i was able to find 2 pictures of 561B on google which look similar, one on digikey site and one on a chinese site
 
nfhiggs

nfhiggs

Well-Known Member
chuckduck said:
On another note. In many of the LED discussions I hear (at least I think I do) discussion about the quality or amount of copper (are they traces) being an indicator of quality. I'll attached a picture to show how the copper extends pretty close to the edge of the board. you can see a circle of copper and it wraps tight to the screw hole and down the edge of the board. That mean anything. Give any indication to build quality?
View attachment 4059380
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When they refer to the copper amount, they are referring to the thickness of the copper layers - half ounce is considered lowest quality, one ounce is "standard" and the best quality is 2 ounce. I used to work for a company that made their own pc boards. Around 2004 they outsourced the raw board manufacturing to China, going with a state owned company called "China Circuits". About 6 months in, they started having quality issues and decided to cut some raw boards open and verify the trace thickness. They found out that they had been receiving boards with half ounce copper when one ounce copper was originally specified.
 
Randomblame

Randomblame

Well-Known Member
nfhiggs said:
When they refer to the copper amount, they are referring to the thickness of the copper layers - half ounce is considered lowest quality, one ounce is "standard" and the best quality is 2 ounce. I used to work for a company that made their own pc boards. Around 2004 they outsourced the raw board manufacturing to China, going with a state owned company called "China Circuits". About 6 months in, they started having quality issues and decided to cut some raw boards open and verify the trace thickness. They found out that they had been receiving boards with half ounce copper when one ounce copper was originally specified.
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Another excellent example that quality checks are needed if you work with this guys. Also if you get 10 times what you ordered, that means not that the 11th delivery will be the same.
 
see4

see4

Well-Known Member
VegasWinner said:
you have no facts. that is called conjecture. You do NOT know you are making up to argue and you call me a dumbass while you make up information to argue with. name a fact you provided so far beyond retail price. you have no clue to wholesale production, i.e. conjecture.
I have facts.I work with Jeff regularly as my regular supplier. we talk all the time that is how that works, business relationships.
I get real boards with real Samsung diodes that work great too.. facts.
I am not here to argue, just point out the differences. If you have facts about HLG and their production costs, I would love to hear more, as they have NDA's.
I do me not worried about HLG.
makes life simple.
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So Jeff is willing to stake his reputation and sell some boards that don't have LM561c? Just because the buyer is only committing to a couple of boards? Sounds like conjecture to me.
 
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