Joe S,
Here is what I have in the train/guest room. My son-in-law is an electrician and this is what he installed. Recessed Halo dimmable LEDS wired to be controlled separately or together, meaning one side or both. Material obtained at Home Depot in a six-pack. They are spaced six feet apart from each other. The center "pillow" LED was the only light there originally. The room size is 18 x22' on a second floor.
Here is the control. HD didn't have a dimmable LED control, but I found it on Amazon. $67.
The slider is for the pillow light. Sorry for the crappy pic.
There will be a backdrop around the two walls adjacent to the layout, so no trains on display on the walls.