:arrow: Budget = $4-500
16 Cobs = over budget
2 x 320W $220 = https://cobkits.com/product/meanwell-hlg-320h-48a/
BTW Greenthumbs u could probably add 2 more cobs to 600W & run 12 COBs in 5x5
then add 4 more Cobs + 200W driver when u have another $200 spare to spend.
Have u spoken to @CobKits...