T8 refers to a type of fluorescent tube light that is 1 inch in diameter. It is commonly used in commercial and industrial settings due to its energy efficiency and bright illumination. T8 bulbs typically come in various lengths and can be found in different color temperatures, making them suitable for various applications. These bulbs are often used in conjunction with electronic ballasts, which help to improve their efficiency and lifespan. The T8 lighting system is a popular choice for offices, schools, and warehouses, providing effective lighting while reducing energy consumption compared to older T12 fluorescent tubes.