Horizon 24 by 13.5-Inch Satellite Grow Light Reflector Bulb, Small Measures 24" x 13.5" x 7"; 6" 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