Feit Electric’s 18-watt Ballast Bypass (Type B) Non-Dimmable Linear LED Tubes replace T8 or T12 fluorescent and LED tubes. They require direct wiring by bypassing the existing ballast. This added installation step enables efficient operation and less maintenance over time. Each Linear LED light produces 1800 lumens, emitting the same light output level as traditional fluorescent linear lights, while using less energy. These versatile 4000K Cool White lights provide clean, mid-range light for both living and workspaces. Use them for multi-purpose lighting or task lighting wherever it is important to feel refreshed and ready to get things done. An ideal choice for most fluorescent linear tube replacement applications, use them in offices, garages, workspaces, warehouses, and more. T48/840/B/LED/10 lights turn on instantly, offering flicker-free full illumination with no warmup time compared to fluorescent tubes. They are mercury-free, with a shatter-resistant coating for safe and easy disposal. Each high-quality bulb offers accurate color-rendering, for more vibrant, true-to-life colors. Lower heat emission extends the life of the tube and ends do not turn black or burn with age. Enjoy lower maintenance costs compared to traditional fluorescent lights. The estimated energy cost is only $2.17 per year. Switch to LED linear lights for your space and get up to 50,000 hours of superior light. That's 45.7 years based on 3 hours of daily use.