Advance High Pressure Sodium Ballast, HID Core/Coil Magnetic, High Pressure Sodium Lamp, 50 W Lamp, 62 W, 120 VAC, 0.55 A, 60 Hz, Pulse Start, -40 deg F Minimum Starting, Power Factor: 1, Dimmable: No, 1 Lamp, Thermal Protection: Class P, 71A7807 Lamp Base Type, Ballast Factor: 1, ANSI S68 Ballast Grade, 2.65 in L x 2.3 in W x 2.2 in H