Explainer: film lighting
Lighting is a fundamental property of cinema. So called “writing in light”, photographed images, whether live-action or cell animation, need illumination. It is the most essential part of a cinematographer’s job to design and implement that illumination – in England and Australia the term “lighting cameraman” is equivalent to “director of photography”.
Films are light. – Federico Fellini
But if lighting is an eternal, omnipresent concern, then techniques, uses, and styles of lighting have varied enormously over time.
In cinema’s beginnings, lighting was almost entirely natural, filming largely executed in glass studios (one reason American companies moved to California was its brighter, year-round sunlight).
By the mid-1910s, however, lighting was mostly artificial, with cinematographers turning to mercury vapour tubes for overall, soft illumination, and carbon-arc spotlights for dramatic effects.
By the 1920s, most of the basic dramatic techniques and functions of lighting used today were acknowledged in craft discourses. In 1931, cinematographer James Wong Howe wrote:
With the early films, lighting merely meant getting enough light upon the actors to permit photography; today it means laying a visual, emotional foundation upon which the director and his players must build.
Figure lighting is used to highlight and model the principal actors in a scene. The most common approach to this is “three-point lighting” (above): a “key light” that provides the main illumination; a “fill light” that fills in shadows on the performer’s face and background; and a backlight to separate the performer from the backdrop (less critical in colour filming).
Three-point lighting is such a prevalent convention in narrative cinema that it is virtually a rule. This will often be supplemented with an eye-light to heighten actors’ expressions. Another aspect of this is “glamour lighting”, designed to enhance the attractiveness of the leading, especially female, performers, and heavily influenced by portrait and fashion photography.
The high point of this technique arguably continues to be the lighting used on Marlene Dietrich in Josef Von Sternberg’s films, images so stylised that the story seems to come to a halt to contemplate the actress purely as an icon.
Effects lighting indicates the use of lighting to create the illusion of light sources emanating from within the story-world. Chiefly, this involves “practical” lighting, made to seem as if emanating from a lamp or window visible in the shot.
Practical lighting is one way cinematographers can shape colour in a scene, using coloured gels over sources in the frame to bathe the entire scene in colour as in the use of the stained glass in All That Heaven Allows (1955), hyperbolising the angst of the mother-daughter dialogue, or to provide splashes of colour for atmosphere and visual density, as in the neon-soaked Blade Runner (1982).
If effects lighting is driven by verisimilitude, the use of practical sources is often motivated as much by dramatic concerns, and so may be more or less central depending on overall lighting aesthetics.
High-key and low-key lighting
Through the 1930s, comedies, musicals, and many dramas were dominated by high-key lighting – a high ratio of fill to key light. This was typically a form of low-contrast soft lighting (dominant in the 1920s and 30s), providing a diffuse, even brightness (below).
Horror films and particular scenes in crime films often made use of high-contrast low-key lighting, with a low ratio of fill to key. This was hard lighting (itself increasingly common from the 1940s), the frame dominated by deep, clearly defined shadows, suiting the dramatic moods of those films, and creating a sense of mystery and suspense through concealment (below).
By the late 1940s, low-key lighting was pursued much more widely, seen to be an aspect of realism (in life, no-one is always evenly illuminated). But the technique is still particularly associated with the film noir, wherein it suggests not just a sense of dread, but also the duality of the characters and the world they inhabit, a pervasive moral darkness eating them from within and without.
Superseding attempts at realism that drove many cinematographers in the 1970s to aim for an illusion of muted, natural light, low-key lighting has been increasingly central from the 1980s across a range of genres (below).
Indeed, a recent study from Cornell University has found that light levels in film have markedly declined from 1935. This can be attributed realism, storytelling, and mood, but it also speaks to an under-acknowledged fact of lighting, its impact on actors.
Arc lights in early filmmaking caused “Klieg eyes” from the intensity of their ultraviolet radiation. With the development of more sensitive film stock, incandescent, tungsten, and halogen lamps largely eliminated this.
In the decades since, as film stock has become more and more sensitive, light levels on set have declined consistently to ease the physical burden on actors and allow them to concentrate on performance; as with glamour lighting, this is a way cinematography serves their interests.
With the rise of digital cinematography today, lighting can be more minimal than ever, while allowing filmmakers to achieve effects, as in night shooting, that will provide grist for exciting innovations for years to come.
Correction: based on a study of film technology, this article initially stated that Klieg eyes were caused by carbon dust from arc lights. However, sources from the archives of the Journal of the American Medical Association clearly state that ultraviolet radiation was to blame.
Paul Ramaeker, Lecturer in Film
A gaffer in the motion picture industry and on a television crew is the head electrician, responsible for the execution (and sometimes the design) of the lighting plan for a production. The term gaffer originally related to the moving of overhead equipment to control lighting levels using a gaff. The gaffer's assistant is the best boy.
Sometimes the gaffer is credited as Chief Lighting Technician (CLT).
The term has been used for the chief electrician in films since the 1930s. The Oxford English Dictionary has a citation from 1936; a 1929 book on motion picture production also uses the term.
The gaffer is responsible for managing lighting, including associated resources such as labour, lighting instruments and electrical equipment under the direction of the Director of Photography (the DP or DOP) or, in television, the Lighting Director (LD).
The DP/LD is responsible for the overall lighting design, but delegates the implementation of the design to the gaffer and the key grip. The key grip is the head grip, in charge of the labour and non-electrical equipment used to support and modify the lighting. Grip equipment includes stands, flags and gobos. The gaffer will usually have an assistant called a best boy and, depending on the size of the job, crew members who are called "set lighting technicians" or "electricians", although not all of them are trained as electricians in the usual sense of the term.
Although gaffer tape is used within the film/TV Industry as a strong cloth-backed adhesive tape, many other types of tape are also used, such as paper tape, pressure-sensitive tape (A.K.A. snot tape), electrical tape, J-LAR, and cloth tape. Gaffer tape is typically utilized by set lighting technicians under the supervision of, and not directly by, a gaffer.