So 10 at 50w would be OK for 4plants in a 120x120? Can't I just get 2 250w in the quantom boards no? Sorry if it a stupid question
Have you looked into boards yet? They don't make a 250w board that I know of. They sell 250w kits that are multiple boards and the appropriate driver. Figure out what you can actually order before you get hung up on what you want.