google.......led resistor calculator you pretty much type in however many your gonna put(series or parralell) and the source voltage(im assuming 12V) and calculate most will tell you the needed resistor and usually a safe pick for resistor to better protect the led's...
...or you could always use ohm's lawyou remeber that back from high school right? lol i guess im weird cuz i do haha
Barks better than it bites......