CXA3070's + HLG-120H-70 + SST-120's?

Mellodrama

Mellodrama

Well-Known Member
Good morning!
I'd like to ask for some peer review. I have six CXA3070's bolted to a hodge-podge of PC coolers, each with its own small driver and fan.

Time to dismantle & start over again.

I want to run them passive. And with one driver (in series) instead of a half dozen.

A Supra Spreadsheet states the Meanwell HLG-120H-C700 can drive 6.1 CXA3070's. Here's a link to Supra's original post...

https://www.rollitup.org/t/matching-drivers-and-cobs.883866/

The pin coolers from Northern Grow Lights look like a good deal. NGL claims the Cooliance SST-120 is capable of dissipating 35 to 60W passive. CXA3070 forward voltage is 38.5V. Figuring dissipation at each COB, 38.5 volts X .7 amps equals roughly 27 watts per COB, correct? Well within the SST-120's rating.

Is my math OK? Does anyone have a better suggestion? I wouldn't mind a slightly more powerful driver as long as it was dimmable, but if you guys don't see anything wrong I'll probably just go with the above.
 
The Dawg

The Dawg

Well-Known Member
Mellodrama said:
Good morning!
I'd like to ask for some peer review. I have six CXA3070's bolted to a hodge-podge of PC coolers, each with its own small driver and fan.

Time to dismantle & start over again.

I want to run them passive. And with one driver (in series) instead of a half dozen.

A Supra Spreadsheet states the Meanwell HLG-120H-C700 can drive 6.1 CXA3070's. Here's a link to Supra's original post...

https://www.rollitup.org/t/matching-drivers-and-cobs.883866/

The pin coolers from Northern Grow Lights look like a good deal. NGL claims the Cooliance SST-120 is capable of dissipating 35 to 60W passive. CXA3070 forward voltage is 38.5V. Figuring dissipation at each COB, 38.5 volts X .7 amps equals roughly 27 watts per COB, correct? Well within the SST-120's rating.

Is my math OK? Does anyone have a better suggestion? I wouldn't mind a slightly more powerful driver as long as it was dimmable, but if you guys don't see anything wrong I'll probably just go with the above.
Click to expand...
I Love That Your Re-Using Your Old Leds. Just Upping Your Game With Heatsinks. I Did That Myself. I Updated From The Artic 11 To The SST-140 And I'm Loving It. The Upgrade Made My Lights More Manageable Plus My Vero Angels Show Me More Love. Here's An Idea HLG-320-1400B This Will Put You At About 53 Watts Per Cob. I'm Running My Citizen 1812's At 65 Watts on The SST-120'S With No Problem. :weed:
 
Mellodrama

Mellodrama

Well-Known Member
Thanks, Mr. Dawg. I appreciate your suggestion. According to the spec sheet on Mouser, the HLG-320-1400"A" is adjustable thru a range of 700 - 1050mA. That would probably be good enough for me. The "B" series requires a couple of pieces of wire and a potentiometer to adjust, right? And you get a wider range with the external pot vs. the "A"s internal?

Rigging up a pot isn't hard, is it? Seems a lot of growers have done just that.

Anyone got a link that explains what pot I should buy? Are pots specific to certain groups of Meanwell drivers, or does one pot rule them all?

EDIT: Some of mau5's videos help to understand the 10K pot & resistor thing.
 
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