Hi all,   
   Well a question came up about measuring the solar constant.   
   (how many watts/m**2)   
   And I thought of measuring the short circuit current from a photodiode.   
   But then you'd have to have some "fudge factor" that convolutes the   
   PD responsivity with the solar spectrum.   
   Does anyone have a good guess for the fudge factor?   
      
   Say for a garden variety PD...   
      
   Thanks   
      
   George H.   
      
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