The EYE HORTILUX® CMH 315W BU (base up) Grow Lamp was designed specifically for horticulture industry. Engineered to allow safe amounts of UV light to pass through the glass, it better imitates a plant’s exposure to natural sunlight and benefits plant growth. The CMH 315W Grow Lamp features a 4100-kelvin color temperature and 32500 rated initial lumens.