Lighting Control Systems in a typical Office environment

Office Image


In this example of an office installation there are various offices off a main corridor.


  • Cleaners use the space between 5:00am and 6:00am, Monday to Friday
  • First office workers arrive at 7:00am, Monday to Friday
  • Last office workers leave before 8:00pm, Monday to Friday
  • No occupancy at weekends


  • Presence detectors recall a constant light scene beween the hours of 7:00am and 8:00pm, Monday to Friday, for the normal working day
  • At 8:00pm, the presence detection is disabled in the offices until 5:00am (Monday to Friday). This reduces the chance of false triggering. If lighting is required outside these times, the switches can override the lighting in a particular area
  • Presence detection is active permanently in the corridor (at a lower level during the evening so any security staff still have general illumination
  • If one office is still occupied, the corridor luminaire can remain on to increase comfort
  • Presence detection for cleaners is enabled between 5.00am and 6.00am (Monday to Friday) and recalls a scene for 100 lux, reducing loading when full illumination is not required
  • Keeping the presence detection when required ensures luminaires are not left on unnecessarily. This reduces energy consumption and extends maintenance cycles


Total Loading
Loads37 Ballasts, Running at 2mA each, Total of 74mA
SensorsPassive Infrared Detectors = 10, Running at 15mA each, Total of 150mA
Microwave Detector = 1 Running at 40mA, Total of 40mA
Switches8, one in each separate room, Running at 10mA each, Total of 80mA
Subnet 1
Total Devices21
Total Loading190mA
Subnet 2
Total Devices28
Total Loading140mA