light value. Use Enter 
or click the control wheel again to store the value.
•However, if you wish to adapt the ambient light conditions to the definition of the selected reading room, dim the light in the room so that the measured ambient light becomes lower that the maximum ambient light.
•Then use Enter 
or click the control wheel again to execute the Measure ALC Value function once more. As a result the actually measured ambient light value will be copied as Measured ALC Value. Finally use Enter 
or click the control wheel again to store the value.