Right, if you dont wanna have to buy a new bulb every 2 days then dont do it ffs.

If you wanna run a MH on a HPS ballast then get a MH conversion bulb.
If you wanna run a HPS on a MH ballast then get a HPS concersion bulb.

And make sure that everything is the same wattage...
LIP Reviewed by LIP on . Mh and HPS running on same ballast hey guys, i was just wondering. I bought to ballasts and i got a hps light and a mh and im running my mh now, but i was wondering, im not to sure if it matters which light goes into which ballast i bought which looked like 2 ballasts that are the same but i got 2 different lights, would that blow my ballast if i put the wrong bulb in casue from what ive read im underthe impression that it makes a difference but when i bought them i wasnt told anything about that i was just given 2 ballasts with Rating: 5