OSRAM BT Control | General information
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2.4.4 Light sensor placement and set point for light regulation
The light sensor measures the sum of daylight and artificial light reflected by a reference surface (e.g. tabletop or floor).
For this purpose, the sensor must be directed as perpendicularly as possible to the reference surface. To achieve a proper
function, the sensor must be placed so that the sensor receives the reflected light of luminaires connected to DALI channel 1.
Direct sunlight falling on the sensor has to be avoided, as well as unwanted measurement of the outside brightness through
the sensor. Therefore, the sensor must not be mounted too close to the window. A sufficient change in the sensor reading
through a change in the illumination is only guaranteed if the maximum mounting height is respected.
Set point adjustment for daylight-dependent control
For the use of the daylight-dependent control function, a set point value must be defined. The set point adjustment must
be performed with minimum daylight and additional light.
Automatic definition of the set point
Via an automatic setup process, the set point is set to 80 % of the maximum illuminance given by the artificial light. During
the auto-setup process, the sensor LED flashes red and green alternatingly for about 3 minutes. For a meaningful measure-
ment of the illuminance, it is important that there are no people or objects between the sensor and the reference surface until
the auto-setup process is completed.
Manual adjustment of the set point
The set point for daylight control can be preset individually via the OSRAM BT Config App.
1 2
L
H
h
Min. and max. values that have to be observed
L > 0.5 x H
Legend
Daylight illuminance
Artificial light
Luminaire channel 1
or channel 2
Incoming daylight
Sum of reflected daylight
and artificial light
Directly connected sensor
with light-sensing element
Height above reflecting
reference surface
Height to lower window edge
Distance to window
1
2
H
h
L
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