FATBOYFRESH
Well-Known Member
i understand that...tohave both....its better for the fact..but ican get the one that uses only hps bulbs..which i read is better..and have two bulbs..one for vegging and one for flowering...it would save money....ithink....???A HPS ballast only works with a HPS bulb.. a MH ballast only works with a MH bulb... or you can get a dual ballast that will work with HPS or MH bulbs... theoritically speaking I do not know why they dont work with each other.. its just what i read in the forums