Anyone work with LED lights

I don't know if this will help you with your specific question, but it's still nice to have.
It tells you how to wire and resist LED's depending on how many you use and what thier power rating is.

http://led.linear1.org/led.wiz


If by "pigtail" you mean each one has a positive and negative wire to a set of LED's you will have to wire them that way.
(A power and ground for each set)
Otherwise the second set will be running off of an a already resisted power supply, and each set after the first will have less and less power.
In fact, I'd bet the second set wouldn't even light.