The Cree TW Series LED T8 bulb looks just like the traditional fluorescent tubes you are replacing - but work even better and lights like a light bulb. The 48 in. T8 LED fluorescent tube equivalents light instantly, are dimmable, and emit 1700 Lumens of beautiful high CRI light, while using just a fraction of the energy and lasting over 50,000 hours. The Cree TW Series LED T8 is the easiest way to upgrade your existing fluorescent fixtures to energy-efficient LED's. Just remove your existing tubes and plug-in the new Cree LED T8 tube that is it. No rewiring needed. The Cree TW Series LED T8 tube is compatible with instant start, rapid start and dimmable electronic ballasts, making it one of the most compatible LED replacement tubes available.