Hortilux 400 watt BLUE Metal Halide Horizontal Lamp with clear glass envelope. This Metal Halide lamp revolutionizes lighting for plant growth! It is designed to provide a fully balanced light spectrum that replicates natural sunlight. The Hortilux BLUE features exclusive Iwasaki (EYE) chemistry that provides levels of Red, Blue and Green spectral energy to optimize plant growth and yield. It works very well for vegetative plant growth and is designed to be mounted horizontally only. It produces 29,000 lumens and is rated for 12,000 life-hours. This lamp will produce great results! Give it a try.