Provided that you opted for theLeda P with motion detector, of course. Then the light comes on exactly when it is needed and switches off again automatically after the selected time delay has expired. The motion detection functions both with and without the brightness measurement. In other words, theLeda P even lights up during the day in this case. This is useful in places with fundamentally difficult light conditions, such as basement entrances, multistorey car parks or backyards.