Step 8: Cord and backing
Once the LEDs and resistor are connected, I got a piece of lamp cord. I cut one conductor longer than the other to up with one end of the wire at each end of the housing. Then I soldered this to the LEDs and resistor.
Once everything was hooked up, it was time for the smoke test. I used an outlet strip with a circuit breaker which would shut off if there was a problem with the wiring, but luckily it worked fine.
Having verified that it works, it was time to unplug it and finish putting it together. I pressed the LEDs firmly into their holes, and closed up the back by gluing on the thin strip of wood I cut earlier on the table saw. Otherwise, tape or some other insulator would work to cover the back and ends.