houselights

[ hous-lahyts ]
/ ˈhaʊsˌlaɪts /

plural noun

the lamps providing illumination of the auditorium or seating area of a theater.

Origin of houselights

First recorded in 1915–20; house + light1 + -s3

British Dictionary definitions for house lights

house lights

pl n

the lights in the auditorium of a theatre, cinema, etc