Why not source you LED power over USB? This is going to be for a computer after all. (because who wants an extra wallwart plugged into their power board)
5V power will mean the LED will have about 1/3 as much current through it, so it will be about 1/3 your current brightness give or take, the LED won't mind the lower current, but if you want to go brighter you will need to reduce the size of your resistor to compensate.
Just snip the end off a USB cable and use the red and black wires if you want to have a "flying lead" coming from your switch box.
If you prefer using a socket rather than flying lead, pin 1 is the 5V power and the last pin is 0V ground (pin 4 for a full size USB socket, pin 5 for a mini/micro).
