4-Pack 23-Watt (100W Equivalent) Spiral Bright White CFL Bulb ENERGY STARTwist light bulbUses 23 watts for 1650 lumens of brightnessBulb life is 8,000 hoursMedium base, most frequently used in general lighting applications including household lighting needsDesigned for indoor or enclosed use only3500K Bright White lightBright White light can give your room a nice white crisp glow, without the coolness of blue an warmness of yellow makes room attractive an comfortableLight bulb dimensions 2"D X 4.5"L