From: henry@spsystems.net   
      
   In article ,   
   Keith F. Lynch  wrote:   
   >Also because 4.8 million out of 150 million is really not much   
   >difference.  It makes a difference of about 3% in light intensity...   
      
   Remember, it's a square law:  a 3% difference in distance turns into about   
   a 7% difference in light.   
      
   (However, Keith is correct to point out that the fourth-root law for   
   temperature greatly reduces the impact of this.)   
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