magic77

Hi hopefully someone can put me out of my mysery I want to wire up 4 LEDs in series and run them off a 12V line in my PC. Now accoring to one site its average that a blue LED is 3.4V which from what I worked out would leave the LEDs underpowered which is fine as dont want them to be so bright is this correct and finally how can you work out the voltage of the LEDs thankss