What does a douser do in stage lighting?

A douser plays a pivotal role in stage lighting by serving to block a beam of light. This is essential for controlling the light's exposure and can help create specific visual effects or transitions in a performance. By blocking light, a douser can also aid in the transition between scenes or in moments of heightened drama, where the manipulation of light can enhance the overall atmosphere. It is a tool that allows for precise control over how and when light hits the stage, significantly impacting the visual storytelling of a production.

The other options pertain to different aspects of stagecraft. Creating a colored effect involves using gels or filters that alter the hue of the light, which is not the primary function of a douser. Enhancing audio effects is unrelated to lighting, as that would involve sound equipment and technicians. Regulating the intensity of light is typically the role of dimmers rather than a douser, which is primarily focused on blocking light rather than adjusting its brightness.