Hadez411
Well-Known Member
So I'm not an idiot but I am new to electric circuits.
I setup 10 luminus cxm-9 (32-37V, 320-640ma, 12-20W) in parallel on a 150W hlg-150h-36A. (32-40V max 4.2A) .
I split them into two groups of 5 and put them on two 4" x 48" pieces of 1/8" aluminum, with 3C/mK thermal grease. A theoretical 75W of cob per piece of aluminum.
The back of the sheet reads 60 celcius with no fan. Voltage across the cob reads 36.5V and amperage from main positive to cob is roughly 320-340ma. For lack of a tC location, the glue surface is around 120C with no ambient fan. I read 160 is the max for glue surface temp.
The power supply is rated for max 4.2A. I have it at max voltage and amperage.
When I read the amperage across the power supply output it was like 5.4A though.
My theory was 10 cobs running in parallel would send 420ma through each for a total of 15W per cob. But it seems like its doing more like 320ma each and 12W. Which is 3 watts shy per cob. Am I just seeing the true numbers with thermal resistance or is there something bogging down my circuit beyond that?
I setup 10 luminus cxm-9 (32-37V, 320-640ma, 12-20W) in parallel on a 150W hlg-150h-36A. (32-40V max 4.2A) .
I split them into two groups of 5 and put them on two 4" x 48" pieces of 1/8" aluminum, with 3C/mK thermal grease. A theoretical 75W of cob per piece of aluminum.
The back of the sheet reads 60 celcius with no fan. Voltage across the cob reads 36.5V and amperage from main positive to cob is roughly 320-340ma. For lack of a tC location, the glue surface is around 120C with no ambient fan. I read 160 is the max for glue surface temp.
The power supply is rated for max 4.2A. I have it at max voltage and amperage.
When I read the amperage across the power supply output it was like 5.4A though.
My theory was 10 cobs running in parallel would send 420ma through each for a total of 15W per cob. But it seems like its doing more like 320ma each and 12W. Which is 3 watts shy per cob. Am I just seeing the true numbers with thermal resistance or is there something bogging down my circuit beyond that?
Last edited:
