Optronic Laboratories : Light Measurement Experts

June 25, 2010…The U.S. Department of Energy has issued results of its GATEWAY demonstration of LED-based Parking Lot Lighting at T.J. Maxx in Manchester, New Hampshire The project involved replacing a total of 28 [22- 400W (nominal) high-pressure sodium and 6- 400W metal halide] luminaires manufactured by Spaulding with 25 LED luminaires manufactured by BetaLED. The T.J. Maxx is the main tenant in the parking lot of the demonstration. In the GATEWAY demonstration each LED luminaire had an array of 120 LEDs. The luminaire was controlled by an integral occupancy sensor that connects to a driver varies its operation between “high” and “low” light output settings.

According to the study conducted by the Pacific Northwest National Laboratory, the BetaLED product achieved an estimated payback in this installation of about 3 years because of high electricity ($0.14/kWh) and maintenance costs incurred by the conventional products at this location. Using the lower national average electric rate of $0.104/kWh and more typical maintenance rates results in a payback slightly more than 5 years. The report says that much of the 58 percent energy savings supporting these payback calculations is attributable to the 47% reduction in average light levels for the “high” output setting

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SSLDesign News Staff

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