The Viqua BA-VT replacement ballast is used in Viqua and Sterilight UV Systems. This electronic ballast fires low-pressure high-output lamps only. The ballast was designed to have a water-tight case and allows the operator to monitor the system's condition. The BA-VT is the replacement ballast for the SC1, SC2.5, SC4, VT1 and VT4 systems.