Westinghouse 8" 22 watt T9 Medium Screw (E26) Base 6,400K Circline Circular Round Fluorescent Light Bulb with Ballast Adapter Cool White 4000K Long Life Plug-in Lasts 9 Times Longer Than 75W Incandescent Bulb Uses 70% Less Energy Than 75W Incandescent Bulb Long life reduces maintenance costs. No heat from light source. Requires less air conditioning. No UV (Ultraviolet) or IR (Infrared Light). No Mercury or Lead. Light Output 1100 Lumens Bulb Light 9000 Hours Adapter Life 40,000 Hours Daylight Bulb Cool Bright Daylight Color Color Temperature:6400 Kalvin Which means Full Spectrum 93CRI. Provides Natural Color as in Sunlight Rapid Start No flickering. Creates a Glare-free and Comfortable Reading Environment Shatterproof. Durable Polycarbonate and aluminum construction