LumaPro(R) Electronic CFL Ballast Ballast Start Type Programmed Input Voltage 120 to 277V AC Number of Bulbs Supported 1 2 Max Bulb Watts 13 W Compact Fluorescent Ballast Bulb Type Dimming No Dimming Type No Dimming Dimming Method No Dimming Dimming Range No Dimming 0 Degrees F Min Starting Temp 50 Degrees F Max Operating Temp Thermal Protection No