There are heatsinks with fans mounted over them. I am unsure what the drivers are, I'll likely have to pull it apart tomorrow and check. I've had it apart once for a good vacuum cleaning and it all went apart and back together pretty easily.
Cool. You can run 2 on each. So probably only use 2 of them for 4 cobs, cause I don't think 6 would stay cool enough even with the active cooling.
Mines ran at 1750, and I can GUARANTEE you they're brighter than at 700/ma. Where'd you hear more lumens at lower currents? @Rahz can justify. More lumens at higher ma, just sacrifice efficiency, that's it. Mine are both one one 50k pot with a 5.4k resistor. So I dim to about 900ma. Even more than 700. That dim, I can ALMOST look at them. Fully powered, it's dizzying to even look anywhere near it.
I believe he was trying to say you get more lumens per watt at the lower current.
You mean 72v 3590's. Not 3570s. And yeah you could do that too, which may be a good option considering the limited amount of space.
You can, but you will be running them at twice the wattage that you would be the 36v cobs probably wouldnt be as cool as twice as many run at half of the power.
is it the same size as what grow converts? Same 2 heatsinks? If so, I'd do EXACTLY what he does.
72vers are just pointless. Especially at 500Ma. If it were me I'd save those drivers for a veg bar of some small Vero 18''s and blue and red diodes. Or for a flower initiator bar. I'd get a new SINGLE HLG-240H-C 1050 & run the 6 (or 3) you want on that.
More cobs is better than less though. For many reasons.
Why don't you get twice as many 3070s or Vero29s you'd be cheaper than the 3590s and more efficient than running the 72v 90s.
Very true. Cxb25''s is a great idea. They're max wattage is around 60 so 500ma would be decently bright.