1. magnetic ballast for Metal halide,sodium lamps 2.70w-400w,220-240V/50Hz 3. ... factor:0.57 4.CE&TUV 5.ISO9001 certified 1. magnetic ballast for Metal halide,sodium lamps 2.70w-400w,220-240V/50-60HZ ... 5.Tw:1306.from ISO9001 certified factory Magnetic ballast,used for high-pressure sodium lamps(SVB) and metal halide vapour lamps(MHB) and high ...