TCP CFL Spring Lamp, 300W Equivalent, Cool White (4100K) MEDIUM (e26) Base Spiral Light Bulb, 4200 Lumens Please note this CFL has a Medium base (Standard - e26) Non Dimmable Lifetime: 9.1 years Uses 68 watts vs. 300 watt incandescent (with same light output) saving you $255 over life of the bulb Estimated Annual Energy Cost to Operate (based on 3 hrs/day): $8.00