Houselights (noun)

1. The lights inside a house or a building.
2. The lighting system that is used to illuminate a building or a room.

Origin:

The word "houselights" refers to the lights inside a house or a building.

Examples:

1. She turned on the houselights as soon as she entered her house.
2. Can you dim the houselights, I want to watch the movie.
3. The houselights in the theater were turned off before the show started.
4. Houselights should be energy efficient to save on electricity bills.
5. We need to fix the houselights, it's too dark in here.