With the careful use of motion detectors, we can reduce energy demands for unoccupied space.  Rather than turning lights off when no one is in the area, we can use bi-level lights to reduce the energy going to the light fixture.  The results in parking lots have been shown to reduce energy demands by as much as 60 percent over the course of a month.  This technology is available with different styles of lighting, including Metal Hallide, LEDs, and Fluorsecent.  Campus is developing a project using bi-level LEDs in Parking Lot E-15.