New style Samsung LM561C Board

[PSUAGRO.]

At 1/3 the cost who cares honestly? As long as they are the leds that they claim to be that is my only concern.

so your just buying the Sammy chips? not attached to any mcpcb then?

When you use Trade Assurance, you get your money back.

has this been confirmed with any board buyers that filed a claim yet? read my question again

Wow, racist much?

troll somewhere else dude, and stop crying about fakes, nobody cares.

click the link in his post first before judging ...........maybe the current Chinese culture is at fault?, not racism when dealing with religion by the original definition.

 

[PSUAGRO.]

Samsung chips attached to a pcb of course.

you do realize that thermal management is as important as the chip(s) right?

Should I be worried about only getting 1/2oz copper instead of the quoted 1oz copper? And why?

That's a question for the hlg guys who've run multiple board simulations I imagine, I can't answer that accurately......... @Stephenj37826 @robincnn some help

 

[legalcanada]

i'm not sure, i think the copper handles and balances the current so if you're running it heavy you'd want more copper but this is a complete guess. i should probably just use google

 

[Theirongrow]

Doubling the amount of copper reduces the impedance of the PCB by 50% The impedance measures the resistance to the passage of the electric current. When less resistance exists to the passage of the current less amount of energy will be spent this means that the electrical cost of the PCB is reduced by 50% which also means less heat generated 2 ounces of cooper also improve signal quality offer better system speed.

 

[dannykay]

copper is only $0.20us an ounce so that's pretty fucking sad to be pinching pennies that bad. i wonder where they learned that ...

China’s Search for the Secrets of Jewish Success (<--- article, hyperlinks aren't obvious on RIU)

Racist much? Damn I thought that we're in 2017 little guy.

 

[Randomblame]

QC isn't worth $40 to me

Every trader has to charge a premium of around 120-150% on the purchase price if he wants to pay his expenses, taxes, employees and so on. This is normal and no rip-off.
You guys need to learn how trading works.
You could also order your jeans in the Far East and get them for a fraction of the price(5-15 instead 100-200$).
Would you do that you could save much more money!?!

 

[Randomblame]

Electrical cost will be reduced by 50%? Surely you are not saying you would only require half of the watts for the same output? In any case it isn’t going to mater for me running 1/3 of the rates power..

Nope, he talkes only about the board not the diodes.
Higher resistance means more voltage droop. These leads to maybe 1-5% more energy cumsumption. With a few boards connected in series this can already cause visible differences in brightness.
Such a board would also need a heatsink earlier than a 2oz board.
Of course, higher temperatures also have a negative impact on the brightness of the individual LEDs. I would at least optimize the cooling of the boards and stick C-channels to the backside to counteract against this.

 

[Randomblame]

Lets take as an example one of the cheap 5m rolls with adhesive LED flex strips. These strips are known for his thin copper traces.
If you connect 12v voltage to one end of this strip, you get about 60w and around 5A going thru the strip.
Now lets cut the strip into five 1m long pieces and operate all in parallel on the same 12v driver, suddenly the same strip consume 72w and the diodes are much brighter.

What happened here?
The culprit here is the resistance, which build up stronger, the longer the distances become.

 

[The Dawg]

Lets take as an example one of the cheap 5m rolls with adhesive LED flex strips. These strips are known for his thin copper traces.
If you connect 12v voltage to one end of this strip, you get about 60w and around 5A going thru the strip.
Now lets cut the strip into five 1m long pieces and operate all in parallel on the same 12v driver, suddenly the same strip consume 72w and the diodes are much brighter.

What happened here?
The culprit here is the resistance, which build up stronger, the longer the distances become.

FM ?

 

[Randomblame]

FM ?

???

 

[The Dawg]

Fucking Magic

 

[Randomblame]

Ahh!
If only my old gray cells were able to I would memorize all these web shortcuts, Lol!

 

[legalcanada]

Racist much? Damn I thought that we're in 2017 little guy.

did you read the article? the one written by a jewish person stating very clearly the chinese try hard to emulate jewish business and finance practices? plus judaism is a religion not a race. you're retarded on all levels

 

[Randomblame]

What was he implying exactly by incorrectly stating the electrical cost is reduced by 50%?

I understand that and agree 100%, however I will be using these at 1/3 of the rated current, less current/watts=smaller wire size required or in this case copper weight.

I don't really see why copper weight would really matter with cooling, the copper is only on the board inbetween the individual diodes and connecting the rows of diodes, it carries the voltage and current, what would that have to do with needing heatsinks or not? I understand if there isn't enough copper there it's just like having an undersized wire that overheats but as I said before I'm running at 1/3 the rated current. Plus these will be mounted in a vertical orientation which will cool better than horizontal, this doesn't mean I won't be measuring the running temperature however.

The copper inside a PCB is also part of the cooling capacity because copper is a better heat conductor than alu or ceramics. More copper means better cooling.
In your case with unknows thickness and resistance I would wire each board separately and in parallel to minimize the effect. No series or parallel strings where the current flows thru more than one board.
You are right vertical orientation will improve cooling and lower current means also lower losts but the percentage losts will be the same.
Watch LEDgardener's video about series and parallel wiring published a few pages back and then include what was said here. A separate parallel circuit would have the smallest effect, so that the losses may be only 1%.

 

[dannykay]

did you read the article? the one written by a jewish person stating very clearly the chinese try hard to emulate jewish business and finance practices? plus judaism is a religion not a race. you're retarded on all levels

Read your comment again dude and tell that you not implying anything racist with that remark.

 

[Nutria]

And now this thread is fucked too. We will get 1 interesting post every 6 about racism and personal offenses

Gg wp go next

 

[Theirongrow]

the thickness of copper directly influences the performance with these two factors
transmission of energy eith 2 to 3 Oz the copper section is larger so the energy can be transmitted freely. Remember that the thinner the driver (cooper) the greater the voltage loss that we will have.
A thick PCB guarantees that the LEDs will light up to their full potential offering the greatest possible luminosity with a thin PCB the LEDs do not light up with good intensity and there is also an additional loss of voltage / brightness due to the voltage drop.
Heat dissipation the temperature is the most damaging factor for the longevity of the LED chip If they get too hot, their brightness useful life and light quality are greatly reduced a thick PCB allows better heat dissipation while a thin PCB can cause the LEDs to overheat.
so I want LM561c mounted on 1/2oz? oz maybe I prefer LM561B + mounted on 2oz?

 

[nfhiggs]

Should I be worried about only getting 1/2oz copper instead of the quoted 1oz copper? And why?

Reduced thermal efficiency, and lower current capacity.

 

[tomate]

I understand copper is a better conductor, but it's not like the entire board has a layer of copper, it only connects the led's to each other.

Wrong! A well designed PCB covers in this case almost the entire surface.

 

[nfhiggs]

So the raised area of copper directly under the coating of the PCB is a separate layer of copper?

Do some googling and read up on "MCPCB".