Copyright LX
Cinematic Expression - Light Ambiance
Light Ambiance is a key element of any lighting situation in that it determines quality of initial perception of Mood.  
If the Image is flashed on screen for split of a second we will have not registered any details but we will have a sense of general
atmosphere which determines perception of  mood within the picture.  Ambiance is an intricate and separate pailing up lighting
instruments ? This is true. The true is also that with such approach one does not have the possibility of changing Mood with just
fluctuating the level of Ambiance. Key elements are the Ambiance and the Key Light.
In the above example, Mood  has been changed with changing level of Ambiance  - a separate element of lighting setup. Initial
High Key Daylight Situation has been transformed into a Low Key Lighting.
(Background color added and table light turned on)