400 Watt, High Pressure Sodium (HPS) Ballast, 480V, ANSI Code: S51/M169. Includes: Dry Film Capacitor, Ignitor and Bracket Kit. *Obsolete & Delisted by Signify - January, 2026*
- Type: Pulse Start
- Volts AC: 480
- ANSI Code: M169
- Wattage: 400
- Shape: ED18 (Elliptical Dimple)
- Wattage: 28
- Shape: T8 (Tubular)
- Length: 4 ft
- ANSI Code: S51
- Light Technology: HID