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Lighting Upgrade Saves $130K Annually, Cuts 1.3M kWh

February 25, 2014 By Linda Hardesty

parking garage Energy ManageThe Shops at Grand Avenue’s parking garage in Milwaukee, Wis., got an LED lighting upgrade, replacing 986 metal halide 150W lights with VPL LED parking vaportight fixtures manufactured by Precision-Paragon (P2), consuming 51 watts each.

The LED retrofit reduced the facility’s lighting energy consumption by over 66 percent.

Current Electric of Brookfield, Wis., performed the retrofit. Current Electric and P2 also collaborated to install occupancy sensors on all 986 LED fixtures to detect when people or moving vehicles are present. When the area is empty of pedestrians or moving vehicles, the fixtures dim their light output by 40 percent.

In addition, daylight sensors are mounted on 450 fixtures in areas where natural light enters the structure during the day. When these sensors detect sufficient natural daylight in their area, they turn off the fixture. The daylight sensors also have a built-in time delay function that avoids startup when natural light levels are temporarily dimmed, such as when a cloudbank passes over the sun.

The VPL’s efficacy of between 97 and 103 lumens per watt, combined with the daylight and occupancy sensors throughout the parking garage, is expected to save the facility over $134,000 in energy costs and 1,344,963 kWh every year.



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