Philips Advance Ballast - 71A8473001D - HPS Ballast 400W S51 Quad Kit Includes: Capacitor, Core and Coil, Mounting Bracket, Igniter and Hardware Type: Magnetic Max # of Lamps: 1 Lamp Wattage: 400 Voltage: 120-277 Volts AC Start Method: Pulse Start Lamp Type: High Pressure Sodium ANSI Code: S51 Length: 4.75" Width: 4.0" Height: 4.4" Warranty: 2 Years