I keep large flashlights in every room. The kind that take the great big batteries. When the lights go out, I turn one on in the room that I am in. I set it on its end so that it shines toward the ceiling. Since my ceiling is white, it reflects the light and lightens the whole room. It also helps to set it in front of a mirror. That way the light is doubled. I usually have enough light then to see into the next room I go into (bathroom or kitchen). I turn the light on in there until I leave to go back to the previous room that I was in before.