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lambert

 
Dictionary: lam·bert   (lăm'bərt) pronunciation
n. (Abbr. L)
The unit of brightness in the centimeter-gram-second system, equivalent to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimeter.

[After Johann Heinrich Lambert (1728-1777), German physicist and astronomer.]


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Measures and Units: lambert
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[Etymology: J. H. Lambert; Germany 1728-77] luminance, irradiance. Symbol L. Metric-c.g.s. 1920 For a point on a diffuser, identically candela·steradian per square centimetre = cd·sr·cm-2, = 104 cd·sr·m-2 = 104 lm·m-2. (The corresponding m.k.s. unit was the apostilb, = 10-4 L. There is no corresponding specially named unit in the SI, but the lux or illuminence has the same basic dimensions as the apostilb.) For a perfect diffuser, 1 L corresponds to the emission of 1/ cd·cm-2, = 0.318 3~ cd·cm-2, = 0.318 3~ stilb. The millilambert (mL) was usual.

Architecture: lambert
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A unit of luminance equal to (1/π) candela per sq cm; equal to the uniform luminance of a perfectly diffusing surface emitting or reflecting light at the rate of 1 lumen per sq cm. Abbr. L.


WordNet: lambert
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Note: click on a word meaning below to see its connections and related words.

The noun has one meaning:

Meaning #1: a cgs unit of illumination equal to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimeter
  Synonym: L


 
 
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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
Measures and Units. A Dictionary of Weights, Measures, and Units. Copyright © Donald Fenna 2002, 2004. All rights reserved.  Read more
Architecture. McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved.  Read more
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