Ok, I found a 400w HPS ballast that I can afford. At first I thought that it was a conversion ballast that will run either HPS or MH, but it turns out that it simply comes with an MH conversion bulb as well as a regular HPS bulb.

What I'm wondering is if that means that any MH conversion bulb can be run by any HPS ballast so long as they're rated at the same wattage, or is that too simple and cheap a solution to spreinging for either two ballasts or one of those really expensive one that will actually run both HPS and MH bulbs?
Tommygirl Reviewed by Tommygirl on . MH Conversion Question Ok, I found a 400w HPS ballast that I can afford. At first I thought that it was a conversion ballast that will run either HPS or MH, but it turns out that it simply comes with an MH conversion bulb as well as a regular HPS bulb. What I'm wondering is if that means that any MH conversion bulb can be run by any HPS ballast so long as they're rated at the same wattage, or is that too simple and cheap a solution to spreinging for either two ballasts or one of those really expensive one that Rating: 5