The long, linear body of these bay lights provides more coverage per fixture than round bay lights. They use fluorescent tubes and are commonly used in facilities with other fluorescent fixtures where frequent bulb changes are expected as part of regular maintenance. Bay lights deliver bright, uniform illumination from high ceilings or open trusses to floors and work surfaces below. They mount at greater heights than other types of overhead indoor lighting fixtures to illuminate warehouses, factories, gymnasiums, hangars, big-box stores, and other large, open spaces. Mounting height (high or low bay), height of the work plane (floor or elevated surface), light distribution (narrow to wide), and lumen output are key factors for selecting a bay light.