Horizon 8-Inch Binary Air Cooled Reflector Bulb with 25 by 18-Inch Long Grow Light Reflector Hood Measures 25" x 18" x 11"; 8" diameter integrated fittings (flanges) on both ends Highest quality German Aluminum (95-percent Reflective); Tempered glass Includes light socket and 15' cord; Standard universal type cord connector Compatible with Magnetic and Digital Ballasts; Accepts all sizes MH and HPS bulbs Maximum airflow over bulb; minimizing heat in growing area