the LEDwiz drives LED's with 5 voltsy (LED's run on 3 or less volts) ...the ones you have seen have a higher ohm rating resistor to make them operate on 12 volts. these are not the correct LED to use with the LEDwiz. these LED's require a smaller ohm resistor to allow them to operate at 5 volts.
if you do purchase this item, the instructions included show how you have to hook them up.
from the manual:
LED's are like goldfish. They don't know when to stop consuming and will "pop" if you feed them too much. For this reason, you must install a resistor in series with the LED to limit the current to an amount that will make the LED bright and happy.