Sunlite FC8T9/CW Fluorescent 22W T9 Circline Ceiling Lights, 4100K Cool White Light, 4-Pin Base This T9 Cirline Bulb Efficiently Utilizes Only 22 Watt Of Energy To Produce A Cool White Light Emits A Bright Yet Comfortable 1250 Amount Of 4100K Light And Comes Equipped With A 4-Pin Base These Long Lasting General Purpose Lamps Average Up To 10000 Hours Of Three Hour Day Operations Ideal For A Wide Range Of Settings From The Household, The Office, Retail Locations, Diners And More Outlives, Outperforms, And Replaces Your Typical Incandescent Equivalent Lamp While Significantly Cutting Energy Costs