Requirement: Minimize light impacts from the building and surrounding site.
Three main compliance areas:
- Controlling light pollution through design and control of interior building lighting.
- Building lighting control system for the classrooms, hallways and lobbies. There is a "light harvesting" feature which turns lights off when there is enough light coming through the windows.
- Classrooms have occupancy sensors to turn the lights on and automatically off. Classrooms also have the "light harvesting" feature.
- Each office has its own individual light control system (Watt Stopper) to turn the lights on and automatically turn them off.
- Controlling light pollution through design and control of exterior lighting power density. The exterior area lighting has been designed to reduce power usage by 20% below the current building code requirements, using energy-efficient light fixtures.
- The exterior lighting systems for the Swenson Center have been designed to meet a standard of 0.10 foot-candles at the site boundaries. (As a reference, moon light is generally measured at 0.25 foot-candles.) Photometric (computer) modeling of the area was used to confirm the design intent was achieved. The exterior lighting is controlled by a photocell on the roof of the building and the master lighting control system to control the on and off times. For safety reasons, the exterior lighting is left on all night; however, light shields have been installed where necessary to protect surrounding residences from light intrusion.