all the ballests ive ever had run both MH and HPS no probs!
there is no conversion needed
the bulb matches the ballast
600 watts HPS 600 watts MH
no probs!
mistyganjatree Reviewed by mistyganjatree on . MH bulb in an HPS? I've read that you can put a regular (non-conversion) MH bulb into an HPS ballast and have it work ok. Apparently it shortens the life of the bulb a bit, but this doesn't matter to me since I change my bulb once a year. Does anyone have direct experience with this? Or know someone who has? Rating: 5