LED voltage, do i need reistors?

[Madmat_tco]

Hi, I'm using 3v LED for my blinkers and my voltage running my lights is 6v, do I need to install a resistor on the LED to bring it down to 3v? If yes, what resistor should i use?

[cabs]

Im not sure myself but if you look in the electronics section there is some awesome diagrams

[Cooper]

http://led.linear1.org/1led.wiz

[Madmat_tco]

Thanks