TCP 5800935K CFL Spring Lamp - 40 Watt Equivalent (only 9W used!) Bright White (3500K) TruStart Spiral Light Bulb TCP CFLs use 75% less electricity than their Incandescent Counterpart, while maintaining the same Light Output Please NOTE: This light bulb has TruStart Technology - Instant on; fast run up time to full brightness, and 20,000 hour life (18.3 years) This bulb is compatible with most OCC Sensors (Occupancy sensors) This bulb has the light output of an incandescent 40 Watt Equivalent light bulb, but only uses 9W of electricity Switching from your incandescents to CFL will save you $68 over the life of this item