Unique to the industry Philips Advanced ballasts are manufactured using an exclusive vacuum impregnation process. This process provides quieter operation and lengthens life protecting against premature ballast failure and voltage breakdown. Philips Advance ballast kits are compatible with most HID metal halide or high pressure sodium fixtures and come complete with capacitor core & coil ignitor mounting bracket hardware. Application Metal Halide Ballast Ansi M59 Circuit Type CWA Open Circuit Voltage 300 Lamp Wattage (W) 400 Watts Input 460 Maximum Input Current 4.1/2.3/2.0/1.7/1.0 Fuse Rating (Amps) 10/7/5/5/3 Voltage (V) 120/208/240/277/480