I did It. I can electrify now.
I have entered into a much larger world.
Using a double quantity of tapewire, eyelets and brads, I wired my first 3 light roombox. A 250ma, 12V, 10W transformer can illuminate up to 4 bulbs. An in-line power switch provides on/off light control without the need of disconnecting the lead-in wire from the roombox. In the photo I am using the Test Probe, not the actual lamp.