Before a performance you should take enough time to set up a good lighting of the stage.
It is optimal if a stage technician can take over some of the work. Any musicians should be well lit, although they should already be present: The musician must not be dazzled, he must be able to see the players well, as well as to recognize any notes.
The players and the presenter should test by "adjusting samples" whether the entire playing area is well illuminated (here, pay particular attention to the fact that the heads are in the light everywhere). One should sit (before the performance) in the audience area and check the illumination. It is also important that the glare from the spotlights is still bearable. It is optimal if the presenter can still see the audience. This is important for the contact with the audience.
If possible, the light should be controllable from a light desk and it should be possible to fade in and out smoothly. For theatres with a little more equipment the following moods are recommended:
1. bright stage (the stage is illuminated everywhere),
2. a central spotlight (for moderation, monologues, songs etc.),
3. colored moods in red, blue and green (green is usually unnecessary, but red and blue allow the light improviser a nice variety to highlight places. Blue: caves, cellars, under water, night, snow etc.; red: desert, fire, beach, love etc.),
4. audience light (a non-dazzling light that can be used to illuminate the auditorium).
It is always advisable to let someone from the group or someone familiar with improvisation drive the light during a performance.