What type of lighting effect would one expect for an immediate change in stage visibility?

The best choice for an immediate change in stage visibility is a snap to effect. This type of lighting transition occurs almost instantaneously, providing a stark contrast in lighting levels. When a snap to effect is executed, the lights can shift from completely dark to full brightness or from one lighting state to another without any gradual transition, making it ideal for dramatic moments or sudden scene changes.

This technique is particularly useful in live performances where quick adjustments are necessary, ensuring that the audience's attention is captured and the intended mood or atmosphere of the scene is effectively communicated. It contrasts sharply with other methods, which involve gradual adjustments and would not provide the instant visibility change that a snap to effect accomplishes.