The patented sealed optic technology allows removal of warmth generated by the lamp without cooling the lamp. Made specifically for double-ended horticulture lamps (now not included). Features German made, UL listed double-ended sockets. Unique double-ended construction allows for maximum optical efficiency and uniformity. Improved spectrum DE lamps used on this fixture focal point at the red component for increased photosynthetic response. They provide improved PAR values and increased PAR/lumen maintenance (as much as 90% PAR at 10,000 hours of operation). The AC/DE’s patent pending design allows removal of warmth generated by the lamp without cooling the lamp below correct operating temperature. 95% reflective textured German aluminum interior with 98% reflective corner inserts offer superb uniformity, output and diffusion. Galvanized steel housing with durable powder coated finish. Manufactured with exacting standards. It features double gaskets (between glass & reflector and glass & frame) for an air tight seal. Hinged glass makes changing lamps and cleaning glass easy. 15 ft detachable lamp cord. Comes with built in level for simple, consistent, level hanging. US patents: D698,987, D698,628, D737,498, D726,116, D771,301, D755,722, 9,016,907, 9,335,038. US Patent Pending: 29/579,733, 29/558,123, 29/550,672, 14/701,134. Chinese patents: ZL201330634881.9, ZL201330642281.7. Foreign Patents Pending: 14825888.2 (Europe), 201530400236.X (China), 2014290774 (Australia), 16111238.1 (Hong Kong), 2918776 (Canada).