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Text File  |  1993-10-07  |  154 b   |  8 lines
  1. {
  2.     Conversion from zonal lumens to watts/steradian
  3. }
  4.  
  5. lum2watt(t0,t1,l) = l / 683 / (omega(t1)-omega(t0)) ;
  6.  
  7. omega(d) = 2*PI * (1-cos(d*PI/180)) ;
  8.