SPL Horticulture Hydroponic 400 Watt High Pressure Sodium HPS Grow Light Bulb Lamp for Magnetic and Digital Ballast (400Watt X 3) Stimulates flower growth and enhances fruit production, Optimized spectrum and high PAR (Photosynthetic Active Radiation) to promote healthy plant growth, High Pressure Sodium's Light Spectrum Stimulates Flower Growth and enhances Fruiting Lifetime 24000 Hours Improved Lamp Life and Lumen Output, 110V power voltage Initial lumen 55000, Color Temp 2000K Socket E39 base, Compatible with any 400w Electronic Ballasts New long lasting life with a high lumen output and low energy consumption