Circular Fluorescent Lamp, Overall Bulb Dia. 8 In., 22 Watts, Light Appearance 4000 to 4999K, Cool White, Lumens 1100, Bulb Color Temp. 4100K, Light Technology Fluorescent, Bulb Type Circline, Light Bulb Dia. 1-1/8 In., Bulb Shape T9, Bulb Base Type 4-Pin (G10q), Color Rendering Index 60, Average Bulb Life 12,000 hr., Bulb Start Type Rapid, 61 Voltage, Bulb Designation FC8T9, Dimmable No, Shatter-Resistant No, ANSI Code 78901-ANSI-4031-1. Only shipped in quantities of 12.