A cutter is a rectangular flag used in lighting applications to shape, block, or direct portions of a light beam, allowing for precise control of illumination and coverage.
In professional lighting and AV environments, cutters are essential tools for managing how light interacts with a scene or workspace. Typically ranging from 18 to 72 inches long and 6 to 24 inches wide, they are positioned on stands or grip mounts to block or shape sections of a light beam without moving the fixture itself. This allows lighting technicians to define highlights, reduce glare, and eliminate unwanted spill.
Constructed from opaque materials such as black fabric or lightweight metal, cutters ensure no light passes through. Their flexibility and precision make them invaluable in commercial AV production, film sets, and broadcast studios, where consistent, well-balanced lighting is critical. In industrial or inspection environments, cutters assist in achieving controlled, uniform lighting conditions necessary for quality control and visual assessment.
While cutters themselves are not regulated as electrical components, their mounting and handling equipment typically follow safety standards established by the Occupational Safety and Health Administration (OSHA) and the American National Standards Institute (ANSI) to ensure proper use in workplace and studio environments.
The cutter originated during the early motion picture era as a practical means to control lighting without repositioning heavy fixtures. Over time, its design was refined for portability and precision, adapting to modern film, broadcast, and industrial lighting systems. Today, cutters remain a key accessory for light management in both creative and technical environments.