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