Williamsport School District in Williamsport, PA, hired GreenTech Energy Services to do a lighting retrofit of four elementary schools, the high school, building exteriors and a garage. Fixtures with T12 fluorescent lamps and standard ballast were retrofit with T8 lamps and electronic low-power ballast. LED technology was used to replace incandescent, metal halide and high pressure sodium lighting. The photo below shows the high school sub-gym halfway through the retrofit. The existing 175-watt metal halide high bays (those casting a greenish glow on the right), were replaced by new 30-watt LEDs. Despite the fact that they consume less than one-fifth as much energy as the older lights, the LEDs shed a crisper, whiter light that eliminates shadows, enhancing aesthetics as well as safety.
