Mark 10(R) Powerline, Electronic, Fluorescent Ballast, Ballast Start Type Programmed, Input Voltage 277V AC, Number of Bulbs Supported 2, Max. Bulb Watts 32 W, Ballast Bulb Type T8, Dimming Yes, Dimming Type Full Continuous Dimming, Dimming Method 0-10V, Dimming Range 100 Percent to 5 Percent, Min. Starting Temp. 50 Degrees F