So before i glued in the LEDs i tried white, i didnt like the way it looked. So i used 5mm green, blue, yellow, and red/orange. I put them in, tested each one and they look great, i added a 220 ohm resistor to the yellow and the red/orange just to test them on 2 AA's. When i hooked those up without them, they would get bright but almost instantly go dim and i didn't want to blow them, so i put a 220 Ohm resistor on there just to test. Im not sure how to wire these though, with a resistor on each LED or just those 2, or one for all 4. i have a PnC kit also with that plugged in its a constant 5 volts i believe, so i want the resistor to be high enough that i can use with AA's, the battery pack or even the PnC plugged in. The forward voltage of the blue is 2.8, they yellow is 2.0, the green is 3.2 and the red/orange is 3.8, on the llamma site it says the red/orange is 3.8 (voltage drop) but id doesn't say a forward voltage, im not sure its the same thing, but like i said i had to add a resistor to make it work right, so maybe its lower than 3.8.
Sorry for the long post, just wanted to include everything.