Bueno -
That's one 3070 lighting up all those plants?!?
Is it on a a motorized tracker of some sort that sweeps back and forth, or is the light fixed?
Are you shuffling these plants around so that each gets a turn under the COB?
Were all these plants recently moved under the 3070 from some other area? Or has it been this way from seed/clone?
Did you swap from a 5000K to a 3000K (or 2700K) when you flipped to 12/12?
It looks like the area is at least 2 ft. X 2ft. 12 plants. They all look healthy and relatively uniform. It's hard to imagine one CXA, even if it's being driven hard, taking care of everything.
It is just one 3070 3000k z2 @ 1.4A since day 5 from seed, the light is just fixed in the center. I have been moving plants around a bit, right now the shortest two are in the center and taller ones on the sides. The lighting on the sides could be a lot better but they are doing ok under what they have for now. This is the veg tent they are in now I just flipped to 12/12 to give them an early start into flower while my flowering batch finishes up. My veg tent exhaust is really weak and I cant run both COBs in there, just the one COB until they get moved to the flower tent then I can add in the other COB.
I plan to make a led veg lighting setup eventually so I am using a more correct spectrum for veg and spreading light out better, two heat sink bars with 4 or 5 4300-4500k XM-L U2s on each bar and a 900mA driver but havent bought any parts yet.
Also forgot to mention veg tent is 1.5 deep x 2.5 wide x 2 ft tall and flower is 1.5 x 2.5 x 3. And there are 11 plants from seed starting flower in the veg tent, all are unsexed so far, going to need some males to show themselves so I can pull em out and make more room for the ladies. Last run out of 15 seeds I had 9 males and 6 females.