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Installation too close to a doorway can trigger a false detection as people walk past. This results in unoccupied rooms being turned on, effectively wasting power. Additionally, the lights will remain on until the idle time has expired because of the false trigger.
The placement of the light level sensors and the control of the lighting are often met with cost issues. To save on the deployment costs installers use a minimal number of light level sensors, and control groups of lighting together. This leads to a poor outcome, as changes to the environment close to the sensor can affect light fittings placed further down the row in a room.