5.3 Some Cautions About Daylighting Controls
PIER (Public Interest Energy Research) offers the following notations:
"Lighting controls that are available today have been demonstrated to save significant electrical energy in commercial buildings. However, the success rate has not been uniform for different types of control products. Previous studies demonstrated that occupancy sensors achieved significant and persistent energy savings at well-monitored building sites, but advanced control strategies that require a systems approach, such as daylighting and load shedding, were less successful. The U.S. lighting controls market is largely composed of manufacturers of components (ballasts, switches, and controls) rather than systems. As a result, lighting control components often do not work well together when specified as systems, especially for dimming applications. Thus, lighting controls for complex strategies such as daylighting have proven difficult to commission in the field, which has resulted in poor operation as well as user complaints. Failure to involve building occupants in the commissioning process is also thought to result in low occupant acceptance of advanced lighting control strategies. Similar difficulties have dogged implementation of advanced shading systems for controlling solar heat gain through building windows."