Square shape is perfect for square growing areas. Very uniform, intense light pattern. Completely sealed featuring hinged glass and double gasket for an air-tight seal. Powder-coated galvanized steel housing. Includes built-in socket & 15 ft lamp cord. Swing Stop retention cable keeps glass from abruptly swinging down. Captured thumb screws & closure mechanism for ease of use and excellent sealing. Interior made from highly reflective aluminum. 6 inch integrated air-cooled fittings with a bead ring to hold ducting firmly in place!