houselights

noun
  1. 1

    One of the lights in an auditorium.

    โ€œThe houselights were dimmed as the curtain went up for the start of the play.โ€

noun
  1. 1

    The lights that illuminate the audience section of an auditorium, theatre, or other entertainment venue.

Source: https://en.wiktionary.org/wiki/houselight, https://en.wiktionary.org/wiki/houselights