XPost: uk.rec.driving   
   From: Daniel47@teranews.com   
      
   Major Scott wrote:   
   > On Tue, 23 Apr 2013 16:58:35 +0100, Dave Plowman    
   > wrote:   
   >   
   >> In article ,   
   >>    Major Scott  wrote:   
   >>> > Pulsing an LED is a way of getting a higher light output from it   
   >>> > without overheating. Overheating an LED kills it in short order.   
   >>   
   >>> Take for example the brake/tail lights.  These are often pulsed for tail   
   >>> and on for brake.  So what you said doesn't make sense.  Anything less   
   >>> than full voltage on (as for brake) will be lower heat.   
   >>   
   >> LEDs are current, not voltage, driven.   
   >   
   > When there's a series resistor, then you can think of them as voltage   
   > driven.  Anyway electronics to lower the current can be made without   
   > pulsing.   
      
   No, the series resistor merely determines the maximum current that could   
   flow through the LED.   
      
   Daniel   
      
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