I am currently working on making two LED eyes for a costume which needs a top row of 2x LEDs, middle row of 6x LEDs and a bottom row of 2x LEDs. I am currently trying to figure out how many volts are needed for the circuit in order to light it (at which point I can see what resistor is needed depending on what batteries I choose). Each LED on this eye is 2.2V except one of the middle ones which is a maximum of 2.4V as it is a replacement for one that died. I am in a hurry to complete this as it must be done by Friday. I have attatched a picture of my setup (done in paint).