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State-of-the-art, optically engineered for high performance based on 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 in this fixture focus on the red component for increased photosynthetic response. They offer improved PAR values and increased PAR/lumen maintenance (up to 90% PAR at 10,000 hrs 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 offers unsurpassed uniformity, output and diffusion. Galvanized steel housing with durable powder-coated finish. Detachable 15 ft lamp cord at the reflector and at ballast. Includes Sun System level for easy, consistent and level hanging. US Patents: D726,116, D740,486 9,335,038. US Patents Pending: 29/516,334, 14/701,134. Chinese Design Patent: ZL201430167976.9.