A PIR Sensor is a Passive Infrared Sensor
which controls the switching on/off of the lighting load when
it detects a moving target.
The built in sensor turns on/off the connected
lighting load when it detects motion in the coverage area.
It has different working principle during the day time and
the night time.
During the day, the built in photocell
sensor saves electricity by deactivating the lighting load
connected to the sensor.
During the night the connected lighting
load is turned on by adjusting the luminosity knob (LUX).