Street Light LED Retrofits Provide Multiple Benefits

Three recent case studies from Acuity Brands’ American Electric Lighting
 (AEL) enumerate the multiple benefits municipalities can get from 
replacing aging street light lamps with new LEDs. <br><br>In Elk Grove, 
California, for instance, the city purchased and installed 9800 LED 
luminaires to replace HPS (high pressure sodium) fixtures and achieve 
energy savings of 60 to 70 percent. Acuity Brands Lighting

James R. Dukart

Three recent case studies from Acuity Brands’ American Electric Lighting (AEL) enumerate the multiple benefits municipalities can get from replacing aging street light lamps with new LEDs.

In Elk Grove, California, for instance, the city purchased and installed 9800 LED luminaires to replace HPS (high pressure sodium) fixtures and achieve energy savings of 60 to 70 percent.

Contractor crews installed 7,500 38-watt LED luminaires to replace existing 100-watt HPS bulbs on post-top units one-for-one. The lamps were mounted on existing 20-foot street light poles. Elk Grove also replaced existing cobrahead units with 2,100 AEL Autobahn ATBO and 135 Autobahn ATBS luminaires. ATBS luminaires were installed along smaller roadways and residential streets; all LED units meeting the city’s illumination standards.

Combined energy and maintenance savings are estimated at $400,000 annually. The city invested $3 million to purchase the LED system and $500,000 to install it, which translates into a payback of approximately nine years. The city superintendent expects the system to operate 20 years without maintenance compared to five to seven years for the HPS units.

In West Richland, Washington, new LED street light lamp installs were driven by a city resolution requiring the reduction of greenhouse gas emissions for state infrastructure programs. The city converted 1,097 city-owned street lights from HPS to LED luminaires, and added AEL’s ROAM control system to program lights for varying intensities based on time-of-day and time-of-year usage. The new LEDs are projected to reduce annual electric consumption by 61 percent, is expected to reduce maintenance costs considerably while helping the city reduce greenhouse gas emissions.

In El Paso, Texas, the city’s General Services Department needed to comply with Texas Senate Bill 898, which requires public utilities to reduce electric consumption by 5 percent per year over the next ten years. El Paso also turned to LED street lights as a solution.

The project’s first phase called for the replacement of 10,600 HPS fixtures located within the city’s residential areas with AEL’s ATBS Autobahn LED luminaires, along with the introduction of AEL’s ROAM lighting control system. Installing the Autobahn LED lighting has the potential to reduce the city’s energy and maintenance costs by 67 percent compared to the operating costs for the previous HPS units.

The city also installed 1,000 100-watt LED luminaires from Holophane, another Acuity Brands company, in the downtown area to replace 175-watt metal halide decorative fixtures. The upgrade resulted in a 50 percent reduction in energy and 10 percent increase in light levels.


Photo courtesy of Acuity Brands Lighting

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