照明 (zhàomíng) is a verb meaning 'to light up, to illuminate' — it focuses on the act of providing artificial light to an area, like lighting a room or stage. Unlike 照耀 (zhàoyào) and 照射 (zhàoshè), which describe natural light (sun, moon) or a beam hitting a surface, 照明 is about purposeful, man-made lighting. 灯光 (dēngguāng) is the noun 'light(s)' itself, not the action.