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It's also a 600W light vs 715+W of the CMH/Vero combo. Run for 12 hours a day all year long, that can be anywhere from a $50 to $150 in energy savings every year. IMO that's the whole point of LEDs. That and less heat issues.

Well to my defense, I just finished building the light today ;) It's 5 strings of 5 cobs in series. Never said I get 350mA, I get 280mA. To my surprise, they still work just fine when dimmed down to 200W.. might just use this as an all around veg/flower light.

Got them on a 480H-C-1400 wired series/parallel (so removing the center cob isn't really gonna work). Yeah I realize the 340 volts are a bit scary but I'm not bothered.

Good idea.. might give this a try with some Q series strips I have laying around. Yeah, it's way overkill but I had 60 Veros from a previous 20x10 tent setup that I wanted to do something with. They're actually the C versions so they run at about 65 Volts in this build.

The A version has the potentiometer integrated in the driver. If you want external control, you need the B version. Most people use the passive pre-drilled pin heatsinks. You can get them from rapidled for example. Trust me, you'll always want more and better light so might as well buy right...

It mostly depends on your budget. How do you plan on cooling the cobs? Personally, I'd go with at least 2 rows of 3 or 3 rows of 3 cobs to get somewhat even coverage. Either way, 1g/W should be possible in any case.

If you're set on those cobs, you could go with a HLG-480H-C-2800 and wire 3 in series and both rows parallel. The A version of these drivers has an integrated potentiometer to set it to anything between 200 and 500W. Either that or you could get any of the 54V drivers and wire all the cobs...

I'm currently working on a light for a 4x4. The goal is to get a pretty even 900-1000 µmol m-2 s-1 across the whole space running it at 500W or less. The COBs are Vero 29, 3500K 80 and 90 CRI. I took some measurements with an Apogee SQ-520 today. At 40cm distance, I get a bit over 1k in the...

I've been using the 69V C variant of the 3500k 80 and 90 CRI for a bit over a year now. No complaints so far, the SE versions are sweet!

Long story short, they all work. COBs require big heatsinks / active cooling solutions, the other 2 options not. Some people run the strips without any heatsink at all but I would advise against doing that for reliability and efficiency reasons. I have some of the Samsung Q series strips and...

Correct

might want to refine that build a bit before you try to start selling