You can run 5x cxb3590 on the hlg 240h-c1400 wattage is 250.06w you would be using 244w, voltage is 89-179v you would be using 174v. With the hlg 320h-c2100b you could only run 4 3590s each driver. So 30 x cxb3590s @ 1400mA would give you a ppfd of 581 in your 64ft square flower room. That's a bit low, @2100mA you would be getting a ppfd of 793 which is pretty good. To give a comparison, a top end HPS 600w in a 4x4 gives a ppfd of 690. So you would be lighting your flower room pretty good with the 2100mA set up, Plus your getting the benefits of multi light source and a better spectrum to boot. For your veg room you would be smashing it with the 1400mA drivers on 25 cobs over 48 square feet. Since you would need 7.5 x 2100mA drivers for your flower room you could go with 5x 320-2100 for the 3k cobs plus run the 10 3500k cobs on 2 240-1400 drivers, losing some light intensity of course.