Advance Magnetic HID Ballast Kit Ballast Start Type Pulse ANSI Code S51/M169 High Pressure Sodium Ballast Bulb Type Number of Bulbs Supported 1 Max Bulb Watts 400 W Input Voltage 120 to 277V AC Input Watts 465 W -40 Degrees F Min Starting Temp Ballast Factor 1 Frequency 60 Hz