All the light sources are either broken, out of energy, out of fuel (includes wax) or simply not there. The scene is illuminated by a single light. This can be a flashlight or electric lantern, but is usually a lighter, a candle or a matchstick. And yet, despite the tiny size and almost insignificant lumen output of the thing, everything looks as if the light was powered by a nuclear reaction. Rooms, even quite large ones, will be lit up to almost daylight level.