XPost: sci.electronics   
   From: jasen@xnet.co.nz   
      
   On 2009-12-29, Pete  wrote:   
   >   
   > I'm curious about the "Important" warning message I found on a wind-up   
   > LED torch (flashlight) I just got for Christmas.  It says:   
   >   
   >  "IMPORTANT: To extend the life of the LEDs allow 20 seconds between   
   >   turning ON & OFF.  Do not turn ON & OFF repeatedly."   
   >   
   > Hunh...?  I can't imagine what effect that would have on LEDs.  There's   
   > no turn-on surge like an incandescent would have.  How could the life   
   > be shortened?   
      
   internal resistance and surface charge effect from the supercap?   
      
   switcher that comes on with a surge?   
      
      
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