Square shape is perfect for square growing areas. New improved design for more efficient and even light distribution. Completely sealed—featuring hinged glass and double gasket for an air-tight seal. Powder-coated galvanized steel housing with handles built in. Includes 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 is 95% reflective German aluminum. 8 in integrated air-cooled fittings with a bead ring to hold ducting firmly in place! Patent No.: D570295, D634469, D698628, D644185, 7641367. Patent Pending: 29/482993, (China) 201430019221.4. Overall Dimensions: 31L x 25.6W x 9.9H Glass Frame Dimensions: 25.6L x 25.6W