Barn doors are adjustable metal flaps mounted to the front of a light fixture to control the direction and shape of the light beam.
In professional lighting, barn doors provide a physical method for shaping light without altering the fixture itself. These hinged panels, typically arranged in sets of two, four, or eight, can be adjusted inward or outward to restrict, cut, or direct the light spread. By reducing spill and enhancing beam focus, barn doors help achieve controlled illumination. They are widely used beyond theatrical and broadcast lighting, including in commercial and industrial spaces for task, display, or architectural lighting. Made from heat-resistant materials like black anodized aluminum, barn doors are compatible with fixtures such as fresnels, PAR lights, and LED panels.
Lighting equipment with barn doors may be referenced under standards from the Illuminating Engineering Society (IES) and UL (Underwriters Laboratories) for fixture safety certification.
The name “barn doors” comes from the resemblance of the flaps to large hinged barn doors. First used in stage lighting, they provided a simple way to control angles and reduce unwanted spill. As lighting design advanced into film, television, and commercial applications, barn doors became a standard accessory for precise illumination control.