Last June UC Davis replaced 101 static HPS and MH wall packs with adaptive LED wall packs by Philips, equipping them with outdoor motion sensors by WattStopper and networked controls from Lumewave. Along with streetlights and post-top luminaires, the wall packs were incorporated into the Adaptive Campus Control System at UC Davis, via an RF network that provides campus-wide lighting control.
The retrofit cut the fixtures' energy consumption by 89 percent, based on an average occupancy rate of 20 percent. UC Davis will save an estimated $76,000 in energy costs over the life of the new wall packs, based on the campus's current low rate of $0.075/kWh. Similar facilities with more typical electricity rates can save even more by adopting the solution.
The project was conducted through the State Partnership for Energy Efficient Demonstrations (SPEED) program, with funding facilitated by the UC/CSU/IOU Energy Efficiency Partnership. PG&E provided rebates for energy savings. The wall pack retrofit is part of UC Davis's Smart Lighting Initiative, a comprehensive effort to reduce lighting energy use on campus to a level 60 percent below a 2007 baseline, in keeping with state goals for energy efficiency. A case study of the wall packs project is now available.