i am looking into copying a popular led board called a quantum board that is made up of 304 samsung 561C leds on a pcb . it seems simple enough to copy !

how ever the max recomened current is 1600ma for a board with 304 561C leds on it each led how ever has a max current off 180ma how have they arrived at 1600ma how do i work out the same ? as i was thinking off putting more of these leds on one board so need to know the correct way to work this out ?

any help would be appreciated

 

Hello,

The leds have an absolute max current of 200 mA.
Likely there are many strings parallel on the board.
For 304 leds I would expect 16 strings of 19 leds or 19 strings of 16 leds.

Bertus

 

Hello,

The leds have an absolute max current of 200 mA.
Likely there are many strings parallel on the board.
For 304 leds I would expect 16 strings of 19 leds or 19 strings of 16 leds.

Bertus

8 strings of 38 leds , but how have they worked out that it needs 1600ma they haven simply timesed the 200max 304 ?? how do you arrive at 1600ma to drive this board ?

 

Hello,

When each string would take 200 mA, then 8 strings will take 8 X 200 mA = 1600 mA.
However it is not wise to run the leds at their limits.

Bertus

 

Hello,

The 200 mA I found, was found on a sales page from alibaba.
I was not able to find a real datasheet for this led.
The only one I could find is the 561B, wich has a maximum current of 150 and are tested at 65 mA.

Bertus

 

Hello,

When each string would take 200 mA, then 8 strings will take 8 X 200 mA = 1600 mA.
However it is not wise to run the leds at their limits.

Bertus

ok i get it , i would be running at around 1400ma , i want to design my pcd around some commonly used mean well drivers in the hlg series

so something like 10 strings of 56 leds would be 10x200ma = 2000ma

 

Hello,

I finaly found the 561C datasheet here:
http://www.samsung.com/global/business/led/products/led-component/mid-power/lm561c
Again the leds are tested at 65 mA , but these have an absolute maximum current of 200 mA.
When you want to run 56 leds in series, the voltage will be about 3 Volts X 56 = 168 Volts.


I do not know any drivers that can manage such high voltage.

Bertus

 

Hello,

I finaly found the 561C datasheet here:
http://www.samsung.com/global/business/led/products/led-component/mid-power/lm561c
Again the leds are tested at 65 mA , but these have an absolute maximum current of 200 mA.
When you want to run 56 leds in series, the voltage will be about 3 Volts X 56 = 168 Volts.

View attachment 128508
I do not know any drivers that can manage such high voltage.

Bertus

https://horticulturelightinggroup.com/pages/board-guide this is what im looking to copy but i want to make a bigger version and perhaps add some other red leds was thinking cree down the centre it looks like those boards are using a

• HLG-320H-C2800 with 2 or 3 or 4 boards for 320 Watts

my version will be the same as 2/3 of their boards but in 1 board

 

Hello,

The driver you show will work between 57 and 114 Volts on the leds.

Bertus

 

now to design my gerber file

 

so am i correct in thinking that each row will only use 200ma but the 1600ma driver will devide its ampage though all 8 rows so not delivering 1600ma or have i got this confused or do the leds only take what they need ?

 

Hello,

I would rather go for 100 - 150 mA on a string.
This would put less stress on the leds.
Have a look at the PDF.

Bertus

 

ive been looking at the array wizard but it does not like it when i put more than 114v and keeps adding resistors.

The quantum board does not use them, i think as you loose power and it affects the efficiency. i think its recomending 1 ohm resisters per line
hears some of my working so far

i want to put 624 lm561c leds on one board in about 6.11 inch x 11.11inch

but might do 11.11x 11.11


the small array of 24 leds it the reds i was thinking off adding on a separate circuit

down the middle of the board

 

0.150a seems to be a good number to land on looking at the Samsung led calculator

 

ok so now trying to work out the best methos to run this many leds series, parrel or mixed the image contains some details

 

sorry more issues

 

sorry more issues

View attachment 128944

It appears this board the chilledled board is using 8 diodes connected in series. Three of these strings are connected together in parallel for a total of 24 diodes and a forward voltage Vf of 23.2v. If you connect 8 of these string sets in series you will get 23.2v x 8 = 185.6v or enough volts to fit into a 1050 driver. Each channel has 192 diodes if you connect both channels in parallel you will 185v and 1200mA so you will underdrive the diodes at 150 mA which is the best way to be for the Samsung diode.

 

now to design my gerber file

Do you happen to have the gerber file for the qb 304?

 

I designed a GrowGreen Board with 384 diodes using 6 rows per channel with two channels. I run the board in parallel and get 100w at 88mA per diode, or I can run the board in series for 200w at 150mA per diode. The boards works great.

For ChiLed boards that use 46.2vF use proprietary design with (16 x 2.9v = 46.4v ) x 6 rows = 96 diodes = 175mA Make four of these circuits 96 x 4 = 384, and you have 384 diodes running amps on a 1050mA driver on a pcb. It appears like he has only three rows, but he has six rows x 16 x 2 x 2 = 192 diodes one channel x 2 channels = 384 diodes.

 

Do you happen to have the gerber file for the qb 304?

If you want to use my gerber file I have it maintained at my supplier in Shenzhen and you are welcome to use it, but you will have to order 13 boards in a run for best price. Let me know, and I will give you info and my supplier. He will contact me for permisison for you to use my gerber files for a board. My boards are 4" x 16" with two channels and solderless connectors.

If you just want to buy a few boards let me know on my site GrowGreenled.wordpress.com you can contact me there under my blog contact