7bc75911   
   XPost: sci.physics, sci.electronics.misc   
   From: hwabnig@.-   
      
   On Thu, 12 Jan 2012 12:49:34 -0800 (PST), RichD   
    wrote:   
      
   >I was looking at some LED flashlights, with ratings   
   > from 50 to 150 lumens.  A p-n junction is a p-n   
   > junction, how do they get such varied outputs?   
   >   
   >I examined the working end, they all look alike,   
   >with a single bulb.   
      
      
   The more current you  force through a p-n junction,   
   the more light will come out.   
   With veryvery much current, it will flash very brightly,   
   for a short duration.   
      
      
   w.   
      
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