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The City of Philadelphia recently contracted with Noresco, a national energy services company, to implement an energy efficiency project in its administrative buildings. GreenTech Energy Services was hired to do the lighting component of the project. This fall, GreenTech completed installation of the exterior lights at the Municipal Services Building and in the portals of City Hall, one of the largest municipal buildings in the world. Obsolete incandescent and metal halide lights were replaced with new LED technology, as detailed below:
- 90-watt floods were replaced with new 17-watt LED PAR 38’s.
- 350-watt metal halides were retrofit with 40-watt LED’s.
- 150-watt metal halide spot floods were replaced by new 45-watt LED floods.
- Several large decorative spheres containing nearly one hundred and fifty 90-watt incandescent lamps each were retrofit with 20-watt LED Par 38’s (see before and after photos above).
This phase of the retrofit achieved a number of goals. The new LED lights do a much better job of accenting the ornate architectural details in the portals of the building. Light levels throughout the area are higher and the light is a crisp white color that enhances aesthetics as well as safety and security.
In addition, LED lighting consumes a fraction of the energy that HID and incandescent lights do, allowing the city to shrink its carbon footprint and lower its utility costs. LED lights also have a much longer lifetime, which will significantly cut maintenance costs, particularly with regard to those fixtures that require scaffolding or lifts to reach.