50 PERCENT ENERGY SAVINGS WITH AUTOMATIC LIGHTING CONTROLS

An electronically ballasted lighting control system was demonstrated a t an office building in the San Francisco Bay Area. The system was use d to demonstrate the energy savings and demand-reduction capabilities of a lighting control system designed to exploit all major control str ategies, including scheduling, daylighting, and lumen maintenance. Aft er 9 mo of operation, lighting energy savings of approximately 50% rel ative to previous usage have been consistently achieved. A novel, two- part control photocell that permits successful implementation of dayli ghting and lumen maintenance strategies was demonstrated.