Cutting-edge, optically engineered for high performance in line with proven, patented designs. Made specifically for double-ended horticultural lamps (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 center of attention on 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). Deep reflector design holds the lamp heat to keep the DE lamp at optimal operating temperature. 95% reflective textured German aluminum interior with 98% reflective corner inserts offer unsurpassed uniformity, output and diffusion. Galvanized steel housing with durable powder coated finish. Detachable 15 ft lamp cord on the reflector and at ballast. Includes the brand new Sun System level for simple, consistent and level hanging. US Patent: D726,116, D740,486 9,335,038. US Patents Pending: 29/516,334, 14/701,134. Chinese Design Patent: ZL201430167976.9.