Morris Products 72902 Fluorescent Emergency Lighting Ballasts, 650 Lumens, 4 Pin CFL Battery backup ballast for fluorescent emergency lighting Provides power for 90 minutes of emergency lighting for four-pin CFL lamps Built-in Ni-Cad battery, charger, and inverter circuit with 24-hour recharge time 120/277 volt input power for multiple uses Meets UL 924 standard for emergency lighting equipment