This 15W compact fluorescent lamp fits in most standard outdoor incandescent fixtures and can produce the same quality of light as a 60W incandescent at one-third of the energy cost. It is Energy Star rated as energy efficient by the Environmental Protection Agency and the Department of Energy, as well as approved by the International Dark Sky Association. The shielded base up or base down design aims light where it is needed without glare or unwanted light trespass.