Ok, first of all hi, i'm new here!

Secondly, i just installed an rgb LED on my lightsaber one as such: https://solarbotics.com/product/LED-RGB-Star43CD/
And i wanted for it to be able to change colour until i get a Nano Biscotte or a Petit Crouton this summer, since i want to add sound eventually, so i came up with this thing:
http://www.ledlightmake.com/led-cont...ver-p-244.html but i think it might be too much for the led to handle or it might not even work

So the question is, adding a resistor would make it viable? If so what kind of resistor?

Also i use a 4 AA batteries pack

I don't know if i made myself clear, i don't really know much about electronics, i hope you guys can help me with this...