Multi-Volt ProLine, Electronic, CFL Ballast, Ballast Start Type Programmed, Input Voltage 120 to 277V AC, Number of Bulbs Supported 2, Max. Bulb Watts 42 W, Compact Fluorescent Ballast Bulb Type, 4-Pin (GX24q), (G24q), (2g11) Bulb Base Type, Dimming No, Dimming Type No Dimming, Dimming Method No Dimming, Dimming Range No Dimming, CA Title 20 Compliant No, -20 Degrees F Min. Starting Temp., 104 Degrees F Max. Operating Temp., Thermal Protection Class P