Product_description: ['Control up to three lamps at one time with this Lutron H3D Dimming Ballast. Using a programmed rapid start method, this ballast breaks the starting process into distinct steps that improve the life of your lamps. ProLighting also offers this high quality Lutron H3DT817GU310 ballast for a competitive reduced price. 120-277V voltage 1 ballast factor Power factor of >9.95 THD Dimming range of 100 percent to 0.7 percent output Minimum starting temperature of 50° Fahrenheit Measures 9.5-inches long, 2.38-inches wide and 1-inch tall Five year warranty included', 'Lutron Hi-lume® 3D High frequency fluorescent ballast is suitable to use with three 17-Watt linear and U-bent T8 lamps. It has voltage rating of 120/240/277 Volt AC and current rating of 0.48/0.25/0.21 Amp. Programmed rapid start ballast with 1 ballast factor, offers greater than or equal to 0.95 power factor. Ballast accommodates solid copper wire of size 18 - 16 AWG. Ballast operates at the frequency rating of 50/60 Hz. It provides Class P protection. Ballast measures 9.5 Inch x 2.38 Inch'] (Page 1)