XPost: uk.rec.driving   
   From: dr6092@gmail.com   
      
    wrote in message news:kl5ibr$qiu$1@speranza.aioe.org...   
   > 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   
      
   The effect relies on the persistance of the eyes to make it appear that the   
   average brightness is higher. Smoothing at source would be less energy   
   efficient.   
      
   Agreed the effect is not pleasant. It would help if they could introduce   
   softer start for indicators and brake light dimming when conditions suggest   
   a slow moving queue.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)