A light meter is used to measure the amount of light in photography. It determines the exact exposure for the picture. Sometimes it will have a computer that helps the photographer choose which speed for the exposure of the exact light. There are two basic types of light meters; reflected and incident. Reflected-light meters measure the light that is reflected by the background that is being photographed. Incident-light meters measure the amount of light that is spotted on the subject.
http://en.wikipedia.org/wiki/Light_meter
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