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 4100K 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/2 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.