Feit Electric’s 40-watt Non-Dimmable Linear Fluorescent Tubes replace F40T12 or T12 tubes. Each light produces 2325 lumens of 6500K Daylight Deluxe White light for both residential and commercial spaces. They are ideal for retail stores, gyms, convenience stores, and hospitals, and high-traffic locations for an alert or focused mood. Replace older, lumen depreciated light bulbs with newer fluorescent light bulbs to maintain full brightness. F40DX/2 lights have an estimated energy cost of only $4.82 per year. Switch to Feit Electric linear tube lights for your space and get up to 20,000 hours of superior light. That's 18.3 years based on 3 hours of daily use.