Designed particularly for double-ended horticulture lamps (no longer included). Made with 95% reflective German stucco pattern aluminum. Features German made, UL listed double-ended sockets. Unique double-ended construction lets in for max optical efficiency and uniformity. Full spectrum DE lamps used on this fixture center of attention 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). Manufactured by Sunlight Supply, Inc. in the us, under license by Hygro-International. US Patents: 6,053,624, 6,783,263, 7,156,539.