It depends on the voltage rating of the LED's. If they can handle 3V a piece, you can run them in series. And, YES it does matter which side is anode and which is cathode. they all need to be facing the same way.
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If one is switched, no voltage will pass through them.

If the LED's aren't rated for 3V or more, you will pop them.


-Chris Hightower-
-Hightower Performance Products, LLC

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