You don't have to use just one supply, you can split it up over two or more. Just make sure all the grouds are together and you don't connect the +5v lines. This is easy because you have to supply power to each short length anyway.
You don't have to use just one supply, you can split it up over two or more. Just make sure all the grouds are together and you don't connect the +5v lines. This is easy because you have to supply power to each short length anyway.