Massive size for increased coverage area and excellent uniformity. Allows closer placement to plants. Includes tempered glass, removable frame, built-in socket and 15 ft lamp cord. Completely sealed?features gasketed glass (between glass and reflector and glass and frame) and hinged frame to hold glass tightly in place. Powder-coated galvanized steel body. Highly reflective aluminum interior offers excellent reflectivity and diffusion. Swing Stop? retention cable keeps glass from abruptly swinging down. Captured thumb screws and closure mechanism for ease of use and excellent sealing. Air-cooling flanges have a bead ring to keep ducting securely in place. US Patent: D698,628.