GE soft white 40 watt A15 ceiling fan light bulb illuminates your home with soft, pleasing incandescent light. It's dimmable to provide just the right brightness. GE soft white A15 ceiling fan bulb is rated to last 1.4 years based on 3 hours per day use. The rugged filament resists vibration better than standard incandescent bulbs. Use this incandescent A15 bulb with a medium base in indoor ceiling lights, ceiling fans and pendant lighting.