... frequency:50-60 Hz. 3) Low raise temperature. 4) Low power consumption. 400w magnetic ballast for ... /50Hz0.4232/50Detailed Product Description.Electromagnetic ballasts for metal halide lamp,sodium lamp,mercury lamp ... ,400W,600W,1000W,2000W.Electromagnetic ballasts for HID lamps.For HS:(high-pressure sodium) discharge lamp ... 1) Main voltage:220V-240V.2) Main frequency:50-60 Hz.3) Low raise temperature.4 ...