XPost: sci.physics, sci.electronics.misc   
      
   In sci.physics Sam Wormley  wrote:   
   > On 1/12/12 8:52 PM, jimp@specsol.spam.sux.com wrote:   
   >> Also, when 1 LED out of a 10 LED array goes bad no one notices but if   
   >> there is only 1 LED it is pretty obvious if it fails.   
   >>   
   >> That's the main reason the LED traffic lights are arrays.   
   >   
   >   Is that what you think, jimp? Multiple LEDs so a failure won't be   
   >   noticed? Give us a break!   
      
   Yep, that is exactly why LED traffic lights are made with arrays.   
      
   A failed traffic light is a public safety issue and must be fixed ASAP.   
      
   It costs a fair amount of money to send out a crew and truck to change   
   the lamp in a traffic light and it disrupts traffic, so minimizing   
   replacement is an agency goal.   
      
   If you ever get out of your bunker where you surround yourself with IPCC   
   reports and into the real world, look closely at the LED traffic lights   
   and you will often see failed LED's; the lamp assembly will be replaced   
   when enough have failed to make it worth the effort.   
      
   BTW, my source of information on this is registered traffic engineers;   
   what's yours?   
      
      
      
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