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Summary: Energy Conservation Utilizing Wireless Dimmable
Lighting Control in a Shared-Space Office
Yao-Jung Wen
Department of Mechanical Engineering, University of California, Berkeley
rio@me.berkeley.edu
James Bonnell
Department of Mechanical Engineering, University of California, Berkeley
jbonnell@ berkeley.edu
Alice M. Agogino
Department of Mechanical Engineering, University of California, Berkeley
agogino@ berkeley.edu
Abstract Overhead light fixtures in shared-space offices are typically grouped into banks, each of which is controlled by
a single switch. Even in offices with daylight responsive systems, the luminaires are divided into zones controlled by one
photosensor per zone. Too often, the geographically-defined "zone" does not correspond to occupied areas, and energy
is wasted illuminating the unoccupied areas. Research has also shown that people have diverse preferences for lighting
and that optimal personal lighting is highly correlated to productivity. Systems that deliver identical lighting can
compromise personal preferences. Various researchers have pointed out that individual light control can increase both
user satisfaction and energy efficiency. The main obstacles are the exorbitant initial cost of long-distance rewiring and
the lack of efficient control.
Leveraging the emergence of wireless sensor/actuator network technologies, we developed a module interfaced with a
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