Which type of spotlight contains two sets of shutters to produce hard-edged and soft-edged light?

The correct choice is the bifocal spot. A bifocal spotlight is designed to have two sets of shutters, allowing for the projection of both hard-edged and soft-edged light. This versatility is achieved by the unique optical system of the bifocal, which typically includes a two-lens design. The first lens focuses the light beam, while the second lens can create different edge effects by manipulating the light before it exits the fixture.

This flexibility makes bifocal spots particularly useful in theatrical lighting, as they can adapt to different scenes and needs by adjusting the sharpness of the beam. Such adaptability is crucial for creating various atmospheres and effects on stage.

In contrast, other types of spotlights serve different purposes. A profile light is known for its precise beam control and is usually equipped with a single set of shutters. An ellipsoidal light shares characteristics with profile lights but is more commonly associated with hard-edged lighting. A Fresnel light, while useful for creating soft-edged lighting through its distinctive lens design, does not have the same dual-shutter system as bifocal spots, limiting its ability to produce a range of edge effects.