Wireless Sensor and Actuator Networks for Lighting Energy ...

esearch lighting system. After all, it is the ability of the lighting system to deliver and
maintain the preferred lighting that concerns the occupants, not the actual numbers.
Common configuration of sensor locations
There was no single conclusive common configuration of sensor placement
found in this test; however, several interesting and similar patterns were observed. All
of the ten subjects spread the sensors on the desktop. The subjects were never advised
not to put sensors close to each other by the investigator, but all of them tried to put
each sensor at a different spot on the desktop. One reasonable guess is that participants
believed it would minimize the chance of multiple sensors being simultaneously
disturbed by placing the sensors apart. In addition to spreading them out, eight of the
ten subjects configured the sensor locations so that the sensors sort of surrounded the
working area. The subjects might have done this in hopes of getting representative
sensor readings of the light they perceived.
Eight subjects had at least one sensor sitting at the corner or edge of the desktop.
Overall, a total of five sensors were put near the left edge of the desk, three sensors
were put at the right corner, two sensors were put at the left corner, and two sensors
were pushed deep near the wall. One extreme case was that a sensor was put on the top
of the computer chassis. This showed that although the subjects were eager to get
representative measurements from the sensors, given the sensors’ current size, the
subjects also tended to get them out of the way while they were working.
Four out of the six subjects who worked on the provided desktop computer put
at least one sensor on or very close to the keyboard, especially on the side where the
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