Fidelux LED Linear High Bays meet the challenging maintenance, safety, and performance requirements of industrial environments through an unbeatable combination of efficacy and lumen output. Featuring custom control options giving you more energy savings. The fixtures are designed to replace T8 and T5 fluorescent, as well as HID fixtures, in locations with 10 to 40 foot ceilings, including big box retailers, gymnasiums, manufacturing facilities and warehouses.