ADVANCE BALLAST, Metal-Halide Mercury 71A55N0500, 120/220/240V, 50HZ,150W/175W C/W CapacitorTechnical Details: Datasheet 71A55N0500 The basic ballast is the open core and coil which is most often used as a component within a lighting luminaire The core and coil also forms the nucleus of Philips advance five other ballast configurations 12 uF capacitor 1. 5 0. 8 A input current (open circuit), 1. 5 0. 8 A input current (starting), 2. 5 to 3. 7 A, 1. 3 to 1. 9 A input current (short circuit), 2 1. 05 A input current (nominal) 3 x 4 in (2 coil)