Turn the light off as you go out.; Please switch off the lights when you leave.

出门时请随手关灯。

《新英汉大辞典》

Please turn the light off before leaving the room.

离开房间前，请把灯关掉。

youdao

And you actually... we could turn the light off and I would see you.

我们可以关灯。，然后我可以看见你们，你散发出红光。

youdao

They used light-sensitive molecules to turn on and off nerve cells in the deep brain structure of mice.

VOA: special.2009.04.07

He could turn off a light and then jump into his bed before the room got dark.

VOA: special.2009.01.24

However, if the solution is a simple DIY remedy like tightening your gas cap, you can go ahead and turn off the light with the app itself, saving you time and money.

ENGADGET: Automatic Link connects phone and car for better driving, we go hands-on (video)

Will the last one out please remember to turn off the black light?

FORBES: From Dungeon to Corner Office: Evolution of the CIO

The phytochrome can then be exposed to a different shade of red light to turn the gene off.

FORBES: Cyborg Yeast Have Their Genes Controlled By Computer