Feit Electric's 30-watt Non-Dimmable Linear Fluorescent Tubes replace F30T8 or T8 tubes. Each light produces 2350 lumens of 4100K Cool White light for both residential and commercial spaces. Use them in living rooms, restaurants, hotel lobbies, and retail. Replace older, lumen depreciated light bulbs with newer fluorescent light bulbs to maintain full brightness. F30T8/CW lights have an estimated energy cost of only $3.61 per year. Switch to Feit Electric linear tube lights for your space and get up to 12,000 hours of superior light. That's 11 years based on 3 hours of daily use.