Philips MainsFit tubes can be directly wired into your existing fixture. Best way to replace existing T8 and T12 fluorescent tubes. Simple rewiring solution to maximize energy savings while reducing maintenance costs by removing the ballast from your fluorescent system. Philips MainsFit LED tubes eliminate the need to replace your ballast due to failure down the road, while also being able to replace both T8 and T12 lamps. Philips MainsFit use a double ended design which makes the product safe and simple to install. In residential settings, this light bulb is perfect for laundry rooms, kitchens, garages and basements and in commercial settings in retail offices, parking garages or industrial spaces. Unlike fluorescent bulbs, Philips MainsFit linear T8 LED light bulbs contain no mercury, offering a safe and sustainable, solution, while operating well in cold temperatures.