From: ming@*merciless*littleold.me.uk   
      
   I need to wire four white LEDs to run off a 12v dc supply (regulated).   
   The Vf is 3.2-3.6 The calculation gives a resistor value of 220 ohms for   
   2 LEDs in series.  Can I wire all four in series without using a   
   resistor or are there good reasons for having it?  The LEDS will be lit 24/7   
      
   TIA   
      
   Bob   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)