Magnetic ballast for high pressure sodium lamp, metal halide lamp & mercury lamp 35W-1000W Magnetic ballast for high ... 50W, 70W, 80W, 100W, 125W, 150W, 250W, 400W, 600W, 1000W All of the silicon steel sheets used for ... temperature rise.3. The surface is smooth and with no paint bubble.4. It can reduce ... appearance.Certificates: TUV, CE, RoHS VS 400W magnetic ballast for metal halide lamp, mercury lamp