Electrically powered illumination sources used to supplement or replace natural light during film production.
Technical Details
Tungsten lamps produce 3200K with an efficiency of 12-25 lumens per watt, while HMI (Hydrargyrum Medium-arc Iodide) spotlights reach 5600K and deliver 85-115 lumens per watt. LED panels today achieve up to 150 lumens per watt with CRI (Color Rendering Index) values of 95-98. Fresnel lenses focus light with a beam angle of 12-60 degrees, whereas softlights ensure uniform illumination over 90-120 degrees. Modern Arri SkyPanel S360-C systems offer 20,400 lumens of light output at 350 watts of consumption.
History & Development
In 1915, Cecil B. DeMille first introduced mercury-vapor lamps in Hollywood, which were superseded in 1930 by more efficient carbon arc lamps. In 1965, Osram developed the first HMI bulbs, reducing power consumption by 75%. Kino Flo revolutionized the industry in 1987 with flicker-free fluorescent tubes, before LED technology conquered the market starting in 2010. Today, RGBW LED arrays with app control and DMX protocol dominate the high-end segment.
Practical Application in Film
For "Blade Runner 2049," Roger Deakins exclusively used LED walls with programmable color gradients to create the dystopian atmosphere. Stanley Kubrick partially lit "Barry Lyndon" (1975) solely with candlelight, amplified by special Zeiss lenses with f/0.7. In "The Revenant," Emmanuel Lubezki combined artificial light with natural light in a 30:70 ratio, using LED mats for fill. Artificial light allows for precise control over intensity, direction, and color, but requires a continuous power supply and generates heat.
Comparison & Alternatives
While natural light is available for free but is weather-dependent and time-limited, artificial light offers constant conditions at higher operating costs. Reflectors and diffusers passively modify existing light, whereas artificial light actively generates light. Hybrid setups combine daylight with HMI spotlights of the same color temperature for seamless transitions. For daytime exterior shots, 18K HMI spotlights are necessary to compete with direct sunlight (100,000 lux).