... Hz. 3) Low raise temperature. 4) Low power consumption. 400w magnetic ballast for metal halide lamp and sodium lamp CodeWattLamp typeCurrent ... ) Providing long service life and super quietness.6) Low magnetic leakage.7) Watts:35W,50W,70W,100W,125W,150W,250W,400W,600W ... ,silicon steel sheet.10) TW:13011) Certificate: CE. 400w ballast magnetic ballast for metal halide lamp