Progress Lighting P7114-60EB White Acrylic Diffusers Mount Horizontally Or Vertically with Standard 120 Volt High Power Factor Electric Ballast, White White Finish White acrylic Size: 26-3/4-Inch Width, 6-Inch Height Extends 4-1/4-Inch Uses (2) 17-Watt F17T8 bulbs Progress Lighting has over 5,000 lighting fixtures offered in our catalog, the largest single source for residential and commercial lighting