The Holophane MB4C400HP48 HPS Ballast is a 400W industrial high-pressure sodium ballast designed for use in facility lighting. This unit, manufactured by Holophane, operates at 480V and is a crucial component for maintaining proper lighting conditions in commercial and industrial settings. With its high-quality construction and reliable performance, the Holophane MB4C400HP48 ballast ensures optimal illumination and energy efficiency in various business and industrial applications.