Use the flashlight of your camera as a torch.
Free, no advertising and just need the permission camera and flash to be installed (noth necessary to work)!
Do you need a light? use the flashlight of your camera as a torch. Push the button to turn on and off the flashlight.
This app uses the camera flash. If your device doesn't have one it won't work.
I will not be responsible for the damages caused by the intensive use of the camera flashlight. It isn't adviceable to keep the flashlight on for a long time, it could stop working.