XPost: uk.rec.driving   
      
   On Mon, 22 Apr 2013 19:44:38 +0100   
   "Major Scott"  wrote:   
   >Surely they can design LED lights on cars to have a higher frequency PWM=   
   >?  Even =A3100K cars flicker dramatically, especially when filmed.  It m=   
   >akes them look really cheap.  All it would take is a higher frequency PW=   
   >M, or a smoothing capacitor?   
      
   They flicker for a reason. If they smoothed the current they might just as   
   well use DC direct from the battery. I don't know the technical reasons why but   
   apparently using the equivalent DC voltage required to get the same brightness   
   as you can get by strobing them would burn them out. I'm sure some electronics   
   guru on here can explain more. But it does lead to interesting effects on   
   video as you say :o)   
      
   NJR   
      
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