Do mirrors increase the light levels in a room, or simply reflect the same light level about more?
by 
WHITE BEAR
ANSWERS: 5
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The latter. As they are not a source of light, they can only reflect what is there.
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In absolute terms, the cannot increase the light levels. But perceptually, they do increase light levels because light which was "lost" by striking the walls is "recycled" to come from a different direction. They therefore provide backlighting to fill out the lighing pattern in the room.
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They can if the light comes from outside or directly as it can multiply the image so there are two light sources, throwing the light more around the room. If a sunbeam comes into the room and hits your mirror it will really be much brighter than if the sunlight just hits the wall and is absorbed into the color of the wall. If the sunlight hits a shining white bedspread on your bed, the light will glow from the bed and illuminate the whole room. Before there ware electricity, people used to place small mirrors behind their candles because it would reflect more light back into the room, almost like having two candles, doubling your candlepower if you will without the expense of burning two. Think of what happens with lighthouses and how a very small light of very little wattage can light a giant powerful beam that will go far out to sea from using mirrors and crystals.
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Mirrors reflect the light that is already in a room , they do not supply light.
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by reflecting light from a mirror you increase its power, that's how a lazier works.
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