UltraStart(R), Electronic, Fluorescent Ballast, Ballast Start Type Programmed/Rapid, Input Voltage 120 to 277V AC, Number of Bulbs Supported 3, 4, Max. Bulb Watts 114 W, Ballast Bulb Type T8, Dimming Yes, Dimming Type Full Continuous Dimming, Dimming Method 0-10V, Dimming Range 100 Percent to 3 Percent, CA Title 20 Compliant Yes, Min. Starting Temp. 60 Degrees F