Goodlite G-10836 FC16T9/1C 40-watt T9 Circline 16-Inch Wide Fluorescent Tube Light Bulb with G10Q Base, Daylight Gu10 4 Pin base, 16"Inch Diameter, 12,000 Hour Average Lamp Life - Can Last Over 10.9 Years - Burns Cooler Than Incandescent Pleasing, Soft White Light - Color Temperature 6500K 3200Lumens More than 80++ lumens/watt (efficacy) Brand Cross Reference FC16T9/DL/RS - TL9C16 Daylight - FC16T9/DL - FC16T9/1C