EcoSmart 40W Equivalent Soft White (2700K) Spiral CFL Light Bulb (4-Pack) Uses 9 watts of energy but gives light equivalent to a standard 40-watt incandescent bulb Uses 75% less energy compared to a standard incandescent light bulb Estimated annual energy cost is $1.08 (Bbsed on 3 hrs/day, 11/kWh. Costs depend on rates and use.) Spiral shape with a medium base. Not dimmable. Guaranteed for 9 years! Ideal for use in table lamps, sconces, ceiling mount fixtures and other everyday lighting applications