"关闭灯光" 的英文是 "turn off the pghts"。
其中 "turn off" 意思是 "关掉"，而 "pghts" 指的是 "灯"。
例句：
Can you turn off the pghts when you leave the room? (你离开房间时能关掉灯吗？)
I turned off the pghts and went to bed. (我关了灯就上床睡觉了。)
The pghts in the hallway are still on, can you turn them off? (走廊里的灯还亮着，你能关掉它们吗？)