light meter

1920–25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
light meter
another name for exposure meter

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Encyclopedia Britannica

light meter

photographic auxiliary device that measures the intensity of light and indicates proper exposure (i.e., the combination of aperture and shutter speed) for film of a specific sensitivity. Modern instruments are of two basic types: the self-generating, or photovoltaic, and the variable resistance, or photoconductive

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
And it's got a light meter on it so it's measuring a profile of light
  penetration as it goes down.
At one side of the sphere is a light meter which measures the light output of
  the lamp.
It is measured using a standard light meter employed for incident light
Use a hand held light meter to measure the amount of light available in work
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