LED Lighting - Parking Lot Case Study


LED Parking Lot Lighting Price, Performance & Payback

LED Parking Lot Lighting is perceived to be more expensive than using high pressure sodium lamp based fixtures (HPS) or metal halide (MH) lighting fixtures. Thus, reductions in maintenance costs are a large part of the savings that used to justify replacement of legacy HPS parking lot fixtures with LED fixtures.

LED Lighting Parking Lot Fixtures

Recent trends in price performance of LED lighting have changed this calculation. It is now often beneficial to replace existing HID outdoor fixtures with LED lighting fixtures, instead of re-lamping the HPS fixtures and replacing the ballasts. In this LED parking lot lighting case study, the payback using electric savings only, was achieved in 1 year and 10 months. By replacing the HPS lamp based fixtures, with efficient LED Lighting in a parking lot application, substantial savings are achieved.

Parking Lot Lighting – Existing Conditions at the Office Park

The HPS parking lot lighting system consisted of 400 watt pole lamps, with the building entrance using 195 watt shoebox HPS fixtures to cover walkways, and several accent HPS flood lights for the building façade and flag poles. The existing HPS fixture’s lamps and ballasts were at end of life, several lighting fixtures were failing, and a group re-lamping/ lighting renovation program was being considered. The total installed load on the HPS pole lamps was 9.2KW and it is estimated that the 41,106 kilowatt (kWh) were being consumed per year. With the substantial reduction in electric load, LED lighting was an attractive alternative candidate for upgrading this parking lot.

Upgrading the Parking Lot Lighting with LED Fixtures

The LED parking lot lighting upgrade replaced the 400W HPS fixtures with 80 watt shoebox style LED fixtures for the majority of the pole lights. LED shoeboxes at 55 watts were installed around the driveway/ entrance. Several small LED flood lights were used for the building facade and flag pole lighting. The LED parking lot lighting system was designed using AGI32, and the design criteria was to meet IES standards. The net reduction in electric cost was $2,930 per year for this small parking lot.

Cost Savings with LED Fixtures in Parking Lot Lighting

The re-lamping program for the HPS parking lot fixtures required the use of a skilled electrician, a bucket truck, for the replacement of ballasts and lamps. The total cost for reworking all of the HPS parking lot fixtures was quoted at $255 per fixture. After accounting for the costs avoided in re-lamping the HPS parking lot fixtures, the year 1 savings of electricity, and rebates on the LED fixtures, the net differential in cost was $2,963.

By replacing the HPS parking lot fixtures with efficient and less costly to maintain LED lighting fixtures, the owners were able to obtain better lighting, and lower operating costs. If the owners had re-lamped the HPS parking lot lighting shoebox pole lights they would have a continuing expensive maintenance program to undertake. With the LED fixtures, they have upgraded the property, increased user satisfaction, and help support the Class ‘A’ building rents at this commercial office park.

Case Study – LED Parking Lot Lighting

The case study (available as a PDF below) includes a full breakdown on the existing HPS parking lot fixtures, an overview of the lighting design and economic analysis, and a set of photographs showing the results of using LED lighting in the parking lots of this office park.

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