Wireless Sensor and Actuator Networks for Lighting Energy ...

[21]. Lighting accounts for 30% of energy usage in office buildings, which assumes the
largest portion of energy usage as shown in Figure 2-4, and hence dominates the
potential of energy savings [2].
Figure 2-3 Energy consumption in commercial sector.
Figure 2-4 Energy usage in office buildings.
2.1.2 Lighting Control Strategies and Potential Savings
Various lighting control strategies have been developed, including daylight
harvesting, light level tuning, occupancy sensing, time switching and load shedding.
The maximum potential lighting energy savings is estimated to be 40-50% with a
combination of properly functioning control strategies [17-19].
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