... lamp Magnetic ballasts 400W for high pressure sodium lampsMagnetic ballasts for HID lampsVoltage: 220-240VFrequency: 50/60HzPower: 35W, 50W, 70W, 80W, 100W, 125W, 150W ... , 250W, 400W, 600W, 1000W, 2000W All of the silicon steel sheets used for electromagentic ballasts are of extra ...