Lutron FDB-T539-277-1 Fluorescent Dimming Ballast, 1-Lamp, T5 F39T5 39W, 277V

Hi-Lume 1% Architectural Programmed Rapid Start Electronic Dimming Ballast Use only with 1- 39W T5 HO Programmed start or rapid start lamp 277V, 60Hz, 0.17A Max Max output voltage 480V