... raise temperature. 4) Low power consumption. 400w magnetic ballast for metal halide lamp and sodium lamp CodeWattLamp typeCurrent ... 250W,400W,600W,1000W,2000W.Electromagnetic ballasts for HID lamps.For HS:(high-pressure sodium) discharge lamp ... service life and super quietness.6) Low magnetic leakage.7) Watts:35W,50W,70W,100W, ... :13011) Certificate: CE. 400w ballast magnetic ballast for metal halide lamp