What would Harry Porter do if he would find himself in a dark room? He would cast a magic spell on his magic wand to light up the room.
Guess what you can do the same with your Android phone. Latest version of Google Now allows you to turn on & turn off the Torch of your mobile phone using the exact same Harry Porter commands.
The voice command is “OK Google Lumos” to turn on the light & “OK Google Nox”.
You can also activate silence mode by calling out “OK Google Silencio”.
Go cast your spell!