Over the years, as the number of buildings and the number
of rooms within building increases dramatically, it was
difficult to manage the waste of energy due to the inefficient
light control and illumination distribution. In addition, it is
not practical to rely on the users to manually control the light
to save energy. A lot of technology and sensors have evolved
recently to manage the excessive energy consumptions like
occupancy sensors (motion detector) which detect activity
within a certain area. They provide convenience by turning
lights on automatically when someone enters a room. They
reduce lighting energy use by turning lights off soon after the
last occupant has left the room. The disadvantage is that it
doesn’t count for the existing light in the room from other
sources. In addition, it depends on the location of the user to
trigger the internal sensor. Motion detectors are great but they
are not sufficient