Knoxville, TN – Parking Lot
Existing lighting consists of 400w metal halide shoeboxes, mounted to 30’ and 39’ poles. The scope of work includes the approach roads, as well as the parking lot. A test area was installed with various options. It was decided to utilize a standardized fixture on each pole. However, in order to achieve high uniformity and maximize efficiency the design utilizes 4 different distribution optics. Existing light levels ranged from 0-1.3 footcandles. The new design will provide 29% more light on a maintained basis.
Controls: The existing system is controlled through the schools “energy management system” which turns the lights on at dusk and shuts them down at dawn.
Due to the proximity to residential areas and the minimal use of the facility after 10 PM, the CREE “Multi-Level” fully integrated occupancy sensor system will be utilized on all luminaires. This will allow for the light levels to be programmed to reduce down to 10% for a designated period of time. If any activity occurs, the
fixtures will return to full brightness for a designated period of time. The programming capabilities of this device are unlimited and will allow for an additional 50% in energy savings.
Replacement Fixtures: Cree “Edge” Shoebox, 134w each.
Warranty: 10 years
48-250w mh @ 295w each = 14160w
95-400w mh @ 465w each = 44175w
Replaced with:
143-92w LED @ 92w each = 13156w
Energy Savings: 45178w
Energy Rate: $.08/kwh
Annual burn hours: 4368
Annual savings: 197342kwh $15,787
Cost: each with labor, matls: $805
Total cost: $115,115
Simple Payback: 7.29 years
