Feit Electric's 16 inch. Fluorescent Circular Light Tube replaces T9 fluorescent tubes. This 2950-lumen 4100K Cool White non-dimmable light uses 40 watts of electricity and is ideal for ceiling fan and fixture applications. Our Compact FC16T10/CW Fluorescent bulbs have a relatively cool running performance, an average life of 12,000 hours/11 years and are FCC compliant. Replace older, lumen depreciated light bulbs with newer fluorescent light bulbs to maintain full brightness. They have an estimated energy cost of only $4.82 per year. Choose a dependable general-purpose bulb for residential or commercial applications.