The Seapora Single Lamp Fluorescent T5 High Efficiency Light System, 36"- 21W is a canopy friendly unit which offers energy efficiency and high performing operation through electronic ballast technology, with an incorporated 10,000K daylight lamp. A parabolic aluminized reflector truly increases the lumen output as well as the overall coverage in your tank. Aluminum housing allows for a cool running process, making this unit thermally conductive. It features a low profile and sleek design, completed with a clean matte black coating for protection of your system and long lasting durability. The acrylic lens cover helps to protect against possible moisture and debris damage.