New style Samsung LM561C Board

nxsov180db said:
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.
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so your just buying the Sammy chips? not attached to any mcpcb then?

see4 said:
When you use Trade Assurance, you get your money back.
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has this been confirmed with any board buyers that filed a claim yet? read my question again

see4 said:
Wow, racist much?

troll somewhere else dude, and stop crying about fakes, nobody cares.
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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.
 
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
 
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.
 
see4 said:
QC isn't worth $40 to me 8-)
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Every trader has to charge a premium of around 120-150% on the purchase price if he wants to pay his expenses, taxes, employees and so on. This is normal and no rip-off.
You guys need to learn how trading works.
You could also order your jeans in the Far East and get them for a fraction of the price(5-15 instead 100-200$).
Would you do that you could save much more money!?!
 
nxsov180db said:
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..
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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.
 
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.
 
Randomblame said:
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.
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FM ?
 
nxsov180db said:
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.
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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%.
 
legalcanada said:
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
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Read your comment again dude and tell that you not implying anything racist with that remark.
 
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?
 
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