Bodine AK250PRB High Intensity Discharge Lamp Backup Ballast

AK250PRB is a Bodine (Philips Bodine) ARC Keeper backup ballast for a single metal halide HID lamp, designed to preserve the lamp's arc during AC power disturbances. This battery-operated device integrates with standard constant wattage autotransformer (CWA) magnetic ballasts, delivering emergency illumination when the supply falters so the lamp does not extinguish. The unit is specified to support one 250 W metal halide probe-start lamp, with an energy-saving 225 W option, making it suitable for high‑bay spaces where reliable backups matter—think gymnasiums, parking structures, hangars, and warehouses. Historically, ARC Keeper backup ballasts are used to maintain lighting during short-term power interruptions in such environments. Note that AK250PRB is a discontinued product with no direct replacement in the Bodine lineup.