Technical data

8.2.
8.1.
8.
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Difference between "control" and
"regulation"
Unlike a control unit, a regulator ensures that the
required illuminance will be maintained.
A control unit executes a command without recording
the result.
Example:Window blind control
A regulator records the result of the operation and can
correct it if necessary.
Example: Radiator thermostat
The process of checking the result of such an operation
and comparing it with the required value is called
"feedback" and distinguishes a regulator from a control
unit.
Principle of the light regulation
circuit
Daylight and artificial light combine to provide illuminance
at user level, i.e. generally speaking, on the working plane
such as a desk or workbench.The process of automatic
regulation of the output (luminous flux) of the lighting
installation according to the varying contribution of
natural light is destined to maintain constant the
predefined level of illuminance on the working plane.
This is achieved by the system making a continuous
comparison between the required illuminance and the
total illuminance resulting from the natural and artificial
light reflected from the working plane and received by a
sensor.
Figure 20: Operating principle of an automatic light regulation
system
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Notes on daylight-
controlled light
regulation