Philips Advance Metal Halide Ballast - 250W | 120/208/240/277V AC | Pulse Start

71A5791-500D is the Philips Advance Metal Halide Ballast. This model is a replacement ballast for the matching fluorescent lamp circuit. Select it from the lamp schedule inside the existing fixture. The listed lamp configuration is 250W MH, which should be checked as a complete lamp-and-count combination. This is the pulse start version, so the fixture wiring and lampholder arrangement must suit that starting method.

For electrical planning, 120/208/240/277V AC is the stated supply requirement for this model. This version lists length 3.90 in., width 4.20 in., height 2.80 in. Those measurements help check physical fit at the ballast compartment. Follow the wiring diagram for this model when making the replacement connections.

Buying tip: Match the lamp designation, number of lamps and supply voltage to the existing ballast.