Feit Electric's 17 watt Non Dimmable Fluorescent Linear Tubes replace F18T8 or T8 tubes. Each light produces 1300 lumens of 4100K Cool White light for both living and workspaces. Use them for multi-purpose lighting or task lighting. An ideal choice for most fluorescent linear tube replacement applications, use them in offices, garages, basements, workspaces, warehouses, and more. Replace older, lumen depreciated light bulbs with newer fluorescent light bulbs to maintain full brightness. F18T8/CW/24 lights have an estimated energy cost of only $2.17 per year. Switch to Feit Electric linear tube lights for your space and get up to 10,000 hours of superior light. That's 9.1 years based on 3 hours of daily use.