Lighting setup with key light above and fill light below the subject, producing even, shadow-free illumination.
Technical Details
The upper light source is typically positioned 30-45° above the camera axis, and the lower one 15-30° below the horizontal. Softboxes between 60x90 cm and 120x180 cm or Octaboxes with a diameter of 120-150 cm are commonly used. The fill light has 25-50% of the light output of the key light. For LED panels, the recommended minimum output is 200W for the lower light and 400-800W for the upper light. Fresnel lights require additional diffusion through frost or silk. The color temperature of both sources must match exactly – deviations exceeding 100K become visible.
History & Development
George Hurrell developed this technique in 1930 for Hollywood portraits and established it as the standard for glamour photography. Cinematographer Gregg Toland first systematically adapted the setup for film shoots in 1940 on "The Long Voyage Home." From the 1950s onwards, Clamshell Lighting became the standard for close-ups of female stars. With the introduction of HMI lights in 1972, Osram enabled higher light outputs with constant color temperature. Modern LED systems since 2010 allow for precise dimming of both levels without color shift.
Practical Application in Film
Ridley Scott systematically used Clamshell setups for Sigourney Weaver's close-ups in "Alien" (1979) to achieve eye reflections despite the dark atmosphere. Emmanuel Lubezki employed the technique in "The Revenant" (2015) with natural overhead light and reflectors as fill. Beauty shots in commercials often use 6:1 ratios for maximum contrast. The lower reflection eliminates under-eye bags and nasolabial folds, while the overhead light sculpts cheekbones. Disadvantages: unnatural lighting in extreme situations, complex setup for camera movements.
Comparison & Alternatives
Rembrandt lighting creates more dramatic shadows through side placement but is less suitable for beauty shots. Butterfly lighting uses only overhead light without fill – resulting in harsher shadows under the nose and chin. Ring lights achieve similar soft shadows but without directional light. Modern LED mats like Litepanels Gemini 2x1 combine both levels in a single panel. For corporate interviews, two Kino Flo tubes mounted one above the other often replace the classic setup. For run-and-gun productions, battery-powered LED panels like Aputure Nova P300c offer a compact alternative.