The Hortilux Blue 400-watt, metal halide bulb provides near-perfect replication of natural sunlight with more of the blue spectrum than other brands. With a blue-, green-, and red-light ratio similar to that of the sun, the Hortilux Blue Bulb enhances vegetation and optimizes overall plant quality. Emits 29,000 lumens, burns in the horizontal position, and boasts a 12,000-hour life.