Philips Advance Metal Halide Ballast - 70W | 277V AC | Pulse Start

The Philips Advance Metal Halide Ballast, model 71A5237-500DBP (189993), is the component described here. 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 70W MH, which should be checked as a complete lamp-and-count combination. Its specified starting method is pulse start; compare it with the existing circuit rather than relying on the housing dimensions alone.

Use the 277V AC version only where the supply and control arrangement suit its electrical specification. Compare length 4.20 in., width 2.65 in., height 2.20 in. with the available space for the ballast compartment, especially when retaining an existing enclosure or shade. 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.