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I'd suggest starting lower and then dialing it up if the plants can take it.

Either would serve you well, but if you can afford it, get the 320. An extra board means better light-spread, even if you don't turn it all the way up.

Correction, my friend - the more adventurous girls have three input ports.

You would NOT want two 600w drivers in a 4x4. One (with appropriately matched boards) would be more than enough.

What COBs, with what driver? If you're running a decent setup, you may see little-to-no gain from switching to boards.

Is 1.5 feet of vertical space a typo?

Just curious, but why run the middle COBs higher than the COBs on the sides?

I have matching 31"x31"x71" tents, each with a matching 250w 4xQB120 fixture, the dimensions of which are 21"x26". I've toyed with the idea of putting both lights in one tent, hung vertically down one side of the tent, with a vertical scrog on the other side. Roughly 15 square feet of grow space...

But you have 16 boards. The cumulative effect must be considered. When I had one 288 at 100w, that made for 33w per square foot (in my cab); not so much.

Dimensions of the grow space?

Average PPFD at recommended power?

Though I agree with you that lower-wattage boards (run without heatsinks) are the sweet-spot (I have two QB120 builds myself), I don't agree that running a QB288 at 100 watts would necessitate a distance of 2-3 feet from the canopy. I've had plants get within 8 inches of a 288 at 100w, without...

One teaspoon, orally. Looped me right the fuck out too. Shocker for me, because it normally takes a shit-ton for me to feel anything more than relaxed. She likes to think it's the "TLC" she put in with the THC, but whatever it was, it knocked me back!

No Everclear 190 in Michigan, so I went straight to QWISO.

Made a little QWISO hash for the first time after my last harvest. Twas a right pain in the ass. Made me start looking at entry-level rosin presses. Not a big fan of concentrates, personally, but I want to do something with all the trim. Maybe I'lI just let the wife cook it all. Last time she...

Should serve you well. Best of luck!

Five single-row strips would be great for a 2x2.

Way more light than you'll use in a 2x2, and the fixture size means it won't scale well in a larger space. You're better off with a 150w driver, and if you ever upsize your grow space, you can build another fixture to run alongside this one.

I don't see any info on what make/model diodes are being used in that TRP strip.

Even though my youngest has outgrown it by a couple of years, the damn thing STILL runs through my head now and then.