Magnetic ballast for high pressure sodium lamp, metal halide lamp & mercury lamp 35W-1000W Magnetic ballast for high pressure discharge lampVoltage: 220-240VFrequency: 50 ... , 400W, 600W, 1000W All of the silicon steel sheets used for electromagentic ballasts are of extra good quality and made under ... beautiful appearance.Certificates: TUV, CE, RoHS VS 400W magnetic ballast for sodium lamp