What are barn doors used for in lighting?

Barn doors are utilized in lighting primarily to control the beam spread of lights, especially floodlights. By positioning the barn doors, which are hinged flaps attached to the front of the light, the user can effectively "shutter" or crop the amount of light that is emitted. This allows for more precise lighting control, helping to shape the light and prevent it from spilling onto unwanted areas of the stage or set.

The design of barn doors makes them particularly effective for altering the shape of the light beam, ensuring that it can be directed where needed. This capability is essential for creating specific lighting effects and enhancing the overall visual presentation in stagecraft.