Centium(TM) Electronic Fluorescent Ballast Ballast Start Type Programmed Input Voltage 120 to 277V AC Number of Bulbs Supported 1 2 Max Bulb Watts 54 W Ballast Bulb Type T5HO Dimming No Dimming Type No Dimming Dimming Method No Dimming Dimming Range No Dimming Min Starting Temp -20 Degrees F