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lumenmore about lumen

lumen

 

  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Lumen  \Lu"men\,  n.;  pl  L.  {Lumina},  E.  {Lumens}.  [L.,  light,  an 
  opening  for  light.] 
  1.  (Photom.) 
  a  A  unit  of  illumination,  being  the  amount  of 
  illumination  of  a  unit  area  of  spherical  surface,  due 
  to  a  light  of  unit  intensity  placed  at  the  center  of 
  the  sphere. 
  b  A  unit  of  light  flux,  being  the  flux  through  one 
  square  meter  of  surface  the  illumination  of  which  is 
  uniform  and  of  unit  brightness. 
 
  2.  (Biol.)  An  opening,  space,  or  cavity,  esp.  a  tubular 
  cavity;  a  vacuole. 
 
  From  WordNet  r  1.6  [wn]: 
 
  lumen 
  n  :  a  unit  of  luminous  flux  equal  to  the  amount  of  light  given 
  out  through  a  solid  angle  of  1  steradian  by  a  point 
  source  of  1  candela  intensity  radiating  uniformly  in  all 
  directions  [syn:  {lm}]




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