IDeAs - Energy-efficient lighting

Daylighting	Natural ventilation/radiant heat	Ground Source Heat	Integrated design
Advanced Glazing & Insulation	Energy-saving office equipment	Renovation Not Green-field
Energy-efficient lighting	Energy Control & Monitoring	Building-integrated photovoltaics

In a high-performance building such as this, an electric lighting system must provide outstanding lighting quality while minimizing lighting power density. To succeed, lighting designers need to leverage the latest in high efficiency sources and fixtures.

The job of the fixtures is to complement the architect’s skylight placement decisions with specialized knowledge of active daylight-sensing lighting control systems, motion detectors and astronomic time clocks.

They also should be ready to incorporate the latest advancements in photovoltaics, high-efficiency transformers and electrical equipment, high-efficiency wiring methods, plug load controls, and resource-efficient design strategies. At the same time, they should minimize use of toxic materials such as mercury and PVC.

Initial estimates for potential energy savings are 60% of the normal lighting load.

	Studio Lighting Currently the light sources with the best combination of high efficiency, good color rendering and long life for indoor applications are linear fluorescent lamps. Three sets of suspended fixtures are installed in the studio space. They use T8 linear fluorescent lamps. These incorporate daylight sensors set to keep electric light within designed criteria levels. With so much daylight entering through the skylights, these sensors ensure that the lights are shut off for most of the day.
	Ledalite fixtures / occupancy controlled The set of fixtures on the north side of the building over the private office area are EdaptTM light fixtures by Ledalite. These have both a direct downlight component for task lighting as well as an indirect uplight capability. Due to the height of the acoustic ceiling, the designers did not want to rely on indirect light alone for task lighting. Each of the four workspaces along the north wall are served by daylight and occupancy sensor controlled fixtures. They can also be adjusted via an interface accessible through each occupant’s computer.
	Central Area Workspace Workspaces in the central open area have the option of installing locally controlled fluorescent or LED desk lamps for task lighting. Each lamp would be plugged into an Isolé surge protector by WattStopper, which is controlled by an integral occupancy sensor.
	Reflective Paint Perceived brightness of a space is based on a number of criteria. In addition to contrast levels and age, a key factor affecting perception is the luminance of the key surfaces in the visual plane. In a typical office, putting 40 fc on an empty desk will do nothing to create the impression of brightness for occupants, while putting the same amount of light on a white wall in an occupant's visual plane will. A key strategy in the design of the studio is to paint the walls with high reflectance (87%) paint and then light them. The design for the studio space ensures there will be high brightness on the walls as well as on the desks and floor.