PONY Electronic CFL Ballast Ballast Start Type Rapid Input Voltage 120/230V AC Number of Bulbs Supported 2 Max Bulb Watts 39 W Compact Fluorescent Ballast Bulb Type 4-Pin Bulb Base Type Dimming No Dimming Type No Dimming Dimming Method No Dimming Dimming Range No Dimming -14 Degrees F Min Starting Temp 89 Degrees F Max Operating Temp Thermal Protection Class P