... and super quietness 4Certificate:CE 1000w Magnetic Ballast , 1000w dimmable ballast , hps ballast 1000w , magnetic ballast Electromagnetic ballasts for metal halide lamp,sodium lamp,mercury lamp 35W,70W,125W,150W ... rise, noiseless, little magnetism leakage, long lifetime 3) The lamp can start quickly and have soft stable light 4. Materials: Copper wire / aluminum ...