RaceHorse, Electronic, CFL Ballast, Ballast Start Type Programmed, Input Voltage 120 to 277V AC, Number of Bulbs Supported 1, 2, Max. Bulb Watts 57 W, 2D, Compact Fluorescent, T5, T5HO Ballast Bulb Type, 4-Pin Bulb Base Type, Dimming No, Dimming Type No Dimming, Dimming Method No Dimming, Dimming Range No Dimming, -22 Degrees F Min. Starting Temp., 194 Degrees F Max. Operating Temp., Thermal Protection Class P