SPL Horticulture STMB 1000 Hydroponic 600W Watt Metal Halide MH Grow Light Bulb Lamp for Magnetic and Digital Ballast Promotes vegetative growth and leaf production,Long service life with high lumen output and low energy consumption, Optimized spectrum and high PAR (Photosynthetic Active Radiation) to promote healthy plant growth. Lifetime 10000 Hours Improved Lamp Life and Lumen Output, 110V power voltage Initial lumen 63000, Color Temp 4200K Socket E39 base, Compatible with any 600w Electronic Ballasts New long lasting life with a high lumen output and low energy consumption