In the case of astronomical operation, memo AST LUX calculates the sunrise and sunset times based on the geographical coordinates of the installation site (or by selecting the city from the menu) and switches the load on during the night according to the chosen program. The brightness probe then, allows lighting even during the day, in case of low light due for example to the presence of particularly stratified clouds.
If memo AST LUX is configured as programmable twilight, the activation of the load occurs only if the brightness measured by the probe is lower than the set threshold and at the same time a daily or weekly program is active.