"On average, about 30 percent of NYC office space can easily accommodate daylight controls
," said Yetsuh Frank, managing director of Strategy & Programs at Green Light
To light the space, "we used a variety of techniques, but mostly combined low factor ballasts (0.71) for non-dim spaces with dimming and daylight controls
throughout the rest of the building," says Michael Barber, a TLP principal.
It also involves use of intelligent controls, presence detectors and daylight controls
which automatically dim or shut off lighting when it is not required.
However, if skylights are already present, or will be installed for non-energy reasons, the incremental cost of achieving the energy savings noted earlier equals the cost of adding daylight controls
. In such cases, the economics are much more favorable and it is very often worthwhile to invest in nondimming lighting controls and, if possible, to tweak skylight design choices to facilitate daylighting.
With sophisticated control systems, including occupancy sensors and daylight controls
, power density can be reduced to 0.5 to 0.7 watts per square foot while maintaining illumination levels suggested by the Illuminating Engineering Society.
The mid- to better-quality line has such features as hinged frames for ease in installation and bulb changing; delay and daylight controls
, manual override, and other features.
Occupancy sensors, daylight controls
and centralized lighting control systems turn off lights when spaces are unoccupied Additionally, all construction materials were purchased within 500 miles of the work site as part of Skanska's selective process for material procurement.
They used daylight controls
to turn the HID on and off, and it was terrible."
Maki's decision to integrate operable daylight controls
into the architecture stemmed from APPC's desire for controllable systems.