灯光 means "lamplight," "lighting," or "illumination" and refers to the light produced by lamps or electric lights. It combines 灯 (lamp) with 光 (light). It is used in contexts ranging from stage lighting to everyday descriptions, as in 灯光很亮 (the lighting is very bright).
舞台上的灯光特别漂亮。
wǔtái shàng de dēngguāng tèbié piàoliang.
The lights on the stage are especially beautiful.
这家餐厅的灯光很柔和。
zhè jiā cāntīng de dēngguāng hěn róuhé.
The lighting in this restaurant is very soft.
远处的灯光在夜色中闪烁。
yuǎnchù de dēngguāng zài yèsè zhōng shǎnshuò.
The lights in the distance flicker in the night.