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Lumen - Definition
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Lumen - Description :
In physics, specifically photometry (optics), the lumen (symbol: lm) is the SI derived unit of luminous flux. It is the amount of light that falls on a unit spherical area at unit distance from a source of one candela. In steradians this is equivalent to the amount of light that falls on a unit solid angle from a light source of one candela. Alternatively, one lumen is the total light produced by an isotropic light source of (1/4p) candelas. A 100 watt incandescent light bulb will output around 1500 lumens.
 
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All text is for informational purposes and is not gauranteed to be accurate. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Lumen".