T-8s are long tubular lighting that are narrower in diameter compared to older version fluorescent tube lights (T-12 tubes). T-8s are popularly used in commercial and office settings, but they are also being used in more green homes. They replace the less efficient long tubes and ballasts and can save an additional 30 percent in energy costs. T-8 lighting tubes also last longer and deliver a better quality of light than previous generation fluorescent tubes.