In 2012, UC San Francisco launched a pilot demonstration of energy-efficient lighting on the top level of its two-tier parking garage on Post Street in San Francisco. That level of the parking structure had lacked lighting for some time, but a sharp increase in use prompted calls from nearby residents expressing safety concerns. CLTC and collaborators succeeded in delivering ultra-efficient lighting where and when it was needed while minimizing light trespass so as not to disturb residents of the apartment building next door.
The wireless lighting control system allows for on/off control according to astronomical time switch (or integrated daylight sensor), curfew dimming, and high- and low-mode tuning. It also allows administrators to create luminaire groups, event schedules and control profiles, monitor energy use, and receive automatic maintenance alerts pinpointing malfunctions when they occur. Based on a measured occupancy rate of 32%, the system uses 88% less lighting energy than a high-pressure sodium system without controls.