GE Specialty 40 Watt Appliance light bulb illuminates microwaves with high intensity light. Use this S11 small base incandescent bulb in appliances. Uses 40 Watts (440 lumens) Rated to last 0.5 years based on 3 hours per day use Each bulb costs 4.82 dollars annually to operate based on 3 hours per day use at 11 cents per kWh Dimmable and works with most dimmer switches Warm, soft white light with 2500 Kelvin color temperature 1 incandescent bulb per package