Eye Hortilux HX57799 EyeHortilux 901791 Daylight Metal Halide Lamps, 250-watt, Blue, 250 watt, Silver Exclusive iwasaki (eye) chemistry provides levels of Red, blue and Green spectral energy to optimize plant growth and yield Designed to provide a fully balanced light spectrum that replicates natural sunlight Used professionally in plant physiological research and biotechnology/pharmacology industries