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Challenge: constant light control in the office

The requirements for suitable workplace lighting are defined in Germany by the Workplace Ordinance. Particular attention is paid to the illuminance. For a computer workstation, for example, this is defined as at least 500 lux.


In order to be able to guarantee the required lux number as constant as possible, the so-called constant light control is used above all in commercial rooms and offices. If there is enough daylight in a room, little or no artificial light is added. If there is little or no daylight in the room, artificial light sources ensure a sufficient level of lighting.


The constant light control is the daylight-dependent control of artificial light with the aim of a constant illuminance.


Solution: Realization of constant light control with Loxone

Since December 2018 the Dutch “Goede Doelen Loterijen” (in German: “Gute Tore Lotterie”) has its headquarters in a renovated industrial building in the south of Amsterdam. The building is an award-winning prime example of sustainable building renovation in the Netherlands.


The lighting of the approx. 600 workplaces is controlled by a constant light control. This guarantees a constant light level of 500 lux at the height of the work surface (approx. 75 cm).

Numerous Loxones measure this  motion detector  first the current lighting conditions. Controlled by  Loxone mini server  and depending on the currently prevailing lux values, a good 40 take over  DALI extensions  the regulation of the installed light sources.


The difference between the lighting intensity at the installation height of the motion detectors and the working height is corrected by a specific correction factor.


In order to avoid unsteady lighting conditions (including flickering), the light intensity of the lamps is not adjusted permanently, but adjusted every few minutes. The adjustment is made by gently fading in or out the light intensity as pleasantly and discreetly as possible.

Tip: Since Config 11, this application example can be implemented with the new "constant light controller" function block.



Constant light control - use case