XPost: sci.electronics.basics, sci.electronics.design, sci.electronics.misc   
   From: erichpwagner@hotmail.com   
      
   On 06/09/2014 05:51, Fester Bestertester wrote:   
   > AC voltage ballasts are superior to DC ballast.   
      
   I would think the ebay sellers desciption is roughly   
   right. In a DC arc the electrode material will "burn   
   off" and migrate only in one direction. In AC arc the   
   wear reverses each cycle and cancels out. This was   
   known from carbon arc lights back 150years ago.   
      
   I am surprised that any headlamp Xenon arcs are DC   
   and if they were DC arc then lifetimes would be   
   very short.   
      
   piglet   
      
   --- SoupGate-Win32 v1.05   
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