Flicker is the rapid variation in light output caused by fluctuations in electrical supply frequency, which may not be visible to the human eye but can affect camera and recording systems.
Flicker refers to subtle, rapid changes in the intensity of a light source that result from variations in electrical input or the operating characteristics of the lamp and its driver. In many cases, flicker occurs at a frequency high enough that it is not perceptible to the human eye. However, imaging systems such as motion picture film cameras, digital video cameras, and high speed recording devices may detect these variations, producing visible artifacts in recorded content.
In commercial broadcast studios, corporate production facilities, training environments, and industrial imaging systems, flicker can create undesirable visual effects. These may include banding, pulsing brightness, rolling exposure lines, or inconsistent illumination across frames. The issue often arises when the frame rate or shutter speed of a camera interacts with the frequency of the power supply driving the lighting fixture.
Alternating current power systems operate at a defined frequency, commonly 50 or 60 hertz depending on the region. Certain light sources, particularly those without high quality electronic drivers or ballast systems, may fluctuate in brightness in sync with the power waveform. While the persistence of human vision smooths out these fluctuations, camera sensors can capture the variations, especially at specific exposure settings.
Modern commercial and industrial lighting systems often incorporate electronic drivers designed to minimize flicker. These drivers regulate output more consistently, reducing visible artifacts in professional recording environments. Flicker performance is particularly important in broadcast production, live streaming, and industrial inspection systems that rely on accurate visual documentation.
Understanding flicker is essential when integrating lighting with imaging equipment. In commercial AV infrastructure and industrial recording applications, controlling flicker ensures stable visual output, consistent brightness levels, and professional image quality across recorded or transmitted media.