... quietness 4Certificate:CE 250W Magnetic Ballast , ballast and ignitor 250w, magnetic ballast 220v/50hz, electronic ballast 250w Electromagnetic ballasts for ... 3) The lamp can start quickly and have soft stable light 4. Materials: Copper wire / aluminum & copper wire / ... at 35W,70W,125W,150W,250W,400W,600W,1000W,2000W7) Suitable for various kinds of products8) Certificate: CE. Magnetic Ballast 600W