Feit Electric’s 40-watt Cool White Non-Dimmable Fluorescent Linear Tubes replace T12 fluorescent tubes. These 2600-lumen lights in 4100K Cool White provide clean, mid-range light for both living and workspaces. Use them for multi-purpose lighting or task lighting. An ideal choice for offices, garages, workspaces, warehouses, and more. Replace older, lumen depreciated light bulbs with newer fluorescent light bulbs to maintain full brightness. F40CWX/10 lights have an estimated energy cost of only $4.82 per year. Switch to Feit Electric linear lights for your space and get up to 20,000 hours of superior light. That's 18.3 years with 3 hours of daily use.