Wireless Sensor and Actuator Networks for Lighting Energy ...

B.2 Comparison of System Performance and User Interface Test Procedure
Testing Procedures for Participants First Exposed to the Research System
(1) Participants start with the initial desktop illuminance of 500 lux under the
research system, use the GUI controller to set the lighting to a comfortable level,
and begin working on the task of their choosing.
(2) At the 5 th , 10 th and 15 th minute the lights are dimmed or brightened by the
investigator. This is to encourage participant override to return the lights to a
comfortable level.
(3) At the 20 th minute the investigator will stop the first set of the experiment and
ask the participant to take a 10-minute rest outside the office. Meanwhile, the
investigator will resume the remaining procedure of the sensor placement
experiment and gather photosensor and light meter measurement as described in
previous section. Before the participant enters the office again for the second set
of 20-minute experiment, the investigator switches the light to commercial
photosensor-dimming system and set the initial light level at 500 lux on the
desktop. Participants will be asked to use the remote controller to override the
initial condition to a comfortable level after settling for the remaining
experiment.
(4) At the 5 th , 10 th and 15 th minute of the second set experiment the lights are again
dimmed or brightened by the investigator using a second remote controller
without notifying the participants.
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