SYLVANIA 40-Watt A15 -Clear- Ceiling Fan Bulbs - Intermdiate Base 2-Pack X22076 Vibration-resistant filaments will not fatigue easily from fan spinning or activity above Intermediate Size Bulb Base, These bulbs are Intermediate base, NOT Medium Base, and NOT chandelier base. Includes (2) A15 Clear Ceiling Fan Bulbs Approx. 1,000 Hours Total Life Operate In Horiztonal, Vertical, And Angeled Positions