Designed specifically for double-ended horticulture lamps (not included). Made with 95% reflective German stucco pattern aluminum. Features German made, UL listed double-ended sockets. Unique double-ended construction allows for maximum optical efficiency and uniformity. Full 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). Manufactured by Hawthorne Gardening Company in the USA, under license by Hygro-International. US Patents: 6,053,624, 6,783,263, 7,156,539.