Advance 71A8291-A CW Autotransformer Ballast is a 250-watt ballast designed for a single 250W S50 high-pressure sodium lamp. As a Constant Wattage Autotransformer (CWA) ballast, it regulates lamp current and supports reliable starting and operation for HID lighting. It accepts 120/208/240/277 VAC input at 60 Hz, aligning with common power configurations for S50 lamps.
