Mark 7(R) 0-10V Electronic Fluorescent Ballast Ballast Start Type Programmed Input Voltage 120 to 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 3 Percent Min Starting Temp 50 Degrees F