What characteristic defines ellipsoidal lights?

Ellipsoidal lights are known for their narrow and precise beam, which is achieved through their optical design. The name "ellipsoidal" comes from the shape of their reflector, which focuses the light into a highly controlled, sharp beam. This feature is particularly advantageous in theatrical settings where directed light is essential for creating specific effects, highlighting actors, or lighting specific areas of a stage without affecting the surrounding environment.

The design allows for various beam sizes and shapes through the use of lens options, enabling stage technicians to manipulate the lighting effectively. This precision makes ellipsoidal fixtures a popular choice for spotlighting and detailed scene work in stagecraft and performance settings.