Quote - The scene consists of a single external light (sun) set at 150% (100% shade), more 'I can not raise it otherwise the outside would not watchable.

Inreality, exactly that would be the case. If you are in a closed buildingwhere bright daylight enters through one window, it will pretty much be impossible to take a photograph where both interior as well as exterior are properly exposerange dynamic range is just too large to be captured on film.