The LEDs I used (complete with resistors) were obtained from Foxy. You will need to solder the resistor to one leg of the LED and solder a length of wire (approx 1m to each leg).

I would also suggest that you mark which wire is neutral and which is positive at this stage, because it will save you a real headache later.

Do NOT connect these LEDs to any power source without this resistor - you'll be asking for some more if you do!