SPL Horticulture STMBD 1000 Hydroponic Double Ended 600W Watt Metal Halide MH Grow Light Bulb Lamp for Magnetic and Digital Ballast Initial lumen 37000, Color Temp 6500K Features high red-orange spectral ratios for great photosynthesis efficiency and healthy plant growth. New improved horticulture lamps that use super high output technology to achieve maximum vegetative growth and maximum flower yield. New long lasting life with a high lumen output and low energy consumption Specifically designed for high frequency electronic ballasts. Horticulture 600-watt Metal Halide MH Double Ended Grow Light Bulb