Mercury vapor bulbs are not suitable for growing. You need MH or HPS.

...mercury vapor ballast?..with a MH bulb?...I don't know..not likely.
Dutch Pimp Reviewed by Dutch Pimp on . Mercury Vapor Lamp My girlfriends grandad owns a junkyard and has some old mercury vapor lamps that he doesnt use anymore, I grabbed one just so I ddin't have to go back there, but does anyone know if it will work with a metal halide bulb? I know the MH bulb needs a pulse I didnt know if this would work. Rating: 5