I dont know if the light is called a 12-bar light and it isnt exactly what is used in the movie. i found all of my electronics at radio shack. it has 12 little red lights and on the bottom there is a set of 2 prongs for each light. just use two wires and thread them through each prong. for that power source, i used something called a d-sub connector in the cassette and on the back side of the track, which is threaded into a AA-battery pack in the box below the handle. its pretty simple and cheap.

if you have any more quesitons just post it.