# Help wiring multiple different colored LED lights

I am working on a project right now, and it is the first time that I have worked with wiring anything. I have 70 LED lights. 10 red, 10 orange, 10 yellow, 10 green, 10 blue, 10 purple, and 10 pink. I know that the red, orange and yellow have a 2v drop, the green, blue and purple have ~3.7v drop, and the pink has a 3.3v drop. I want to wire all of these LEDs together into a total of 14 parallel circuits coming off of one series circuit. Each parallel circuit will have 5 LEDs of the same color. So there will be 2 parallel circuits of 5 red LEDs, 2 parrallel circuits of Orange LEDs, etc.

I would like to power the LEDs with 9 volt batteries. I am not 100% sure how many I need to get an appropriate voltage to power all of the LEDs. That is the first thing I could use a hand on.

I also have a handful of 200 ohm resistors. I would like to place resitors at the beginning of each parallel circuit so that each led in the circuit does not need its own resitor (I know that this is not the best way to do it if an led fails, but I am limited on resources and need this done semi quickly) I need to know how to calculate just how many 200 ohm resistors each parrallel circuit needs. The part that gets me confused is the different voltages for the different colors. I am not sure how to factor that in.

Edit: I could probably get away with 3.3 volts drop on the green, blue, purple, and pink so that they all have the same.

Each led takes ~25 ma

• Does each LED take 25 mA as normal operating current, or is 25 mA the maximum allowed? Commented Apr 22, 2015 at 0:19