The 18W 4ft LED Tube as clear, glass tube can replace any T8, T10 or T12 fluorescent tube fixture of 50W and bring energy-savings of not less than 75%. This 4ft LED glass tube by being compatible with the existing fluorescent tube ballast can easily retrofit the existing fixture by having the existing fluorescent tube removed and be put in its place. With a beam angle of 220°, this 4ft LED tube can provide for directional lighting to large-enough areas under consideration and work well for any standard ceiling height. This tube can work with a ballast only, kindly check the ballast compatibility list, Being UL listed, the product is entirely safe for use. You have a completely hassle-free manufacturer’s warranty for at least 3 years on this product.