Backlighting or sidelighting technique that separates subjects from the background by illuminating their edges, creating spatial depth and visual separation.
Technical Details
Edge lighting is typically achieved using Fresnel lights from 650W to 2000W or LED panels with 200-400W output. The standard color temperature is 5600K (daylight) or 3200K (tungsten), with modern LED systems offering stepless adjustments between 2700K-6500K. Barn doors, snoots, or honeycomb grids limit light spread to a 10-40° beam angle. For human subjects, the light is positioned 1-2 meters behind the subject at a height of 2-3 meters. Special variants include "hair light" (directed specifically at the hair) and "shoulder light" (emphasizing the shoulder area).
History & Development
Cecil B. DeMille and cinematographer Alvin Wyckoff developed early edge lighting techniques in 1915 for "The Cheat" to separate the protagonist Fannie Ward from the background. In the 1940s, Gregg Toland perfected the technique for "Citizen Kane" (1941) using 10kW carbon arc lamps. Hollywood studios in the 1950s established the three-point lighting system with mandatory edge lighting. Modern LED technology since 2010 enables remote-controlled edge lighting setups with DMX protocol and real-time adjustment of lighting parameters.
Practical Use in Film
Roger Deakins systematically used edge lighting in "Blade Runner 2049" (2017) for character isolation in dark industrial settings. Emmanuel Lubezki employed natural edge lighting from a low sun in "The Revenant" (2015), enhanced by 4x4 meter reflectors. The workflow requires precise light measurement with a spot meter and continuous monitoring via monitor scopes. Edge lighting reduces post-production work for green screen shots by 20-30% by creating clean subject edges. The technique becomes problematic with rapid camera movements or windy outdoor shoots.
Comparison & Alternatives
Edge lighting differs from background lighting by directly illuminating the subject rather than the set. Unlike fill light, it increases contrast instead of reducing it. Modern alternatives include programmable LED tubes like Astera Titan or Quasar Q-LED, which enable remote-controlled edge lighting simulation. For low-budget productions, 200W LED panels with diffusion gels replace costly Fresnel setups. Digital Intermediate (DI) can create edge lighting simulation in post-production but does not achieve the natural plasticity of real lighting.