Tungsten light, however powerful it may appear, contains a strong element of red. Daylight contains a strong element of blue. Color film has to be specially balanced for use with artificial or daylight. If a daylight film is used in artificial light, it will appear ver pink where the tungsten light has been strongest. An artificial light film used in daulight appears correspondingly blue.
Filters are available to convert one type of film to another.
It is then quite permissible to supplement daylight with articial light. When filming in a room the light is always directional. This means that a figure near the window will appear well-lighted from one side while the other will be in heavy shadow. The use of reflectors A white sheet or board or a mirror may be used as a reflective surface. A reflector is especially useful for close-up shots.