Massive size for increased coverage area and excellent uniformity. Allows closer placement to plants. Includes tempered glass, removable frame, built-in socket & 15 ft lamp cord. Completely sealed?features gasketed glass (between glass & reflector and glass & 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 & closure mechanism for ease of use and excellent sealing. Air-cooling flanges have a bead ring to keep ducting securely in place. US Patents: D698,628.