Utilitech 100-Watt (23W) PAR38 Medium Base Warm White (3000K) Outdoor Light bulb dimensions 5" x 4.75" PAR 38 light bulb Uses 23 watts for 1400 lumens Bulb life is 30000 hours or 27 years at 3 hours a day Designed to be weather proof Medium base most frequently used for flood, recessed or spot light applications