I have a Sunlight Supply, Inc. dual ballast (400W MH + 600W HPS).

I've been using it for less than 60 days... so I can't tell you how it works out in the long run. At least not yet. But so far, so good!
turtle420 Reviewed by turtle420 on . What Is The Best Brand And Model Ballast? 1- HydroFarm Pro/XtraSun/Radiant/Powerhouse 2- SunSystems/1/VI/X 3- SunLeaves/Pulsar/Not A Clue Never Used Em Rating: 5