if I added a 100R resistor to each of the LEDs
No need to add one. There is already a 100R resistor in that LED assembly that you have from SparkFun. If you were making your own LED module then you would have to add it.
if I added a 100R resistor to each of the LEDs
No need to add one. There is already a 100R resistor in that LED assembly that you have from SparkFun. If you were making your own LED module then you would have to add it.