SmartMate(R) Electronic CFL Ballast Ballast Start Type Programmed Input Voltage 120 to 277V AC Number of Bulbs Supported 1 2 Max Bulb Watts 21 W Compact Fluorescent Ballast Bulb Type 4-Pin (G24q) (PL-C) Bulb Base Type Dimming No Dimming Type No Dimming Dimming Method No Dimming Dimming Range No Dimming 0 Degrees F Min Starting Temp 158 Degrees F Max Operating Temp Thermal Protection No