This Keystone 120-Volt High Pressure Sodium ballast kit operates 1 S55 100-Watt High Pressure Sodium lamp. The kit includes ballast, capacitor, mounting brackets and hardware. See the document below for complete specifications. Compatible with 150-Watt S55 high pressure sodium lamps. Single tap input 120-line voltage, R-NPF/R-HPF circuit type.ANSI designation: S55Line voltage: 120Regulation: 5%Frequency: 60 HzRecommended fuse A: 15Circuit type: R-NPF/R-HPFInsulation class: 180 Deg CCapacitor value: 14 DegF for HPFCapacitor voltage rating: 280-VoltCapacitor temperature rating: 90 Deg CWinding materials: copper/copperLamp starter: XG-01Agency certification: RU, cRUMaximum distance to lamp: 3 ft.