Night for day

Day for night, also known as La Nuit Américaine (American night), is the name given to cinematographic techniques used to simulate the night while filming in daylight. These production techniques include using tungsten-balanced rather than daylight-balanced film stock, special CTB filters, and infrared films, or they involve under-exposing shots by three stops. These techniques create the illusion of darkness or moonlight, and they are close to the effect of indirect sunlight.