1) Efficient growth lighting in green house 2) Day prolonging additional lighting of exterior plant cultures 3) Helpful to plants growing, horticuluture and hydroponics industries This HPS grow lamp allows you to stretch your growing season to 365 days a year. Fine-tune your lighting system to provide optimum spectral energy level that promotes vigorous plant growth. HPS grow lamps provide up to 10% more available energy for plant growth than that of standard high pressure sodium lamps. HPS grow lamp's enhanced spectral energy distribution is designed to grow a wider variety of plants.