I mentioned in a separate thread posted yesterday about my new Premier Hotel that it was the first building on my layout that had lighting installed. Even though it was a Woodland Scenics built up that came with LED lighting, since it required a weird 5 V or something supply, I pulled those out and used cheap 12V LED modules I bought on Amazon (more below). Today I began working my way north on my Main street with the building right across the street from the hotel - the Henry family Ford dealership. It took all of five minutes to install., wire up, and get the roof back on. It's wonderful. I have one old Lifelike DC power supply from my N-scale days, set to 11 volts (they are a bit too bright at 12V) that will power the entire street's twenty-odd buildings. The Ford dealership was at one time an MTH susquehanna Hat Factory, but has had several floors removed.
The Hotel and the dealership look so good with lights on, even in broad "daylight."
Yes, that's a Cobra (my favorite type: one of the very first series) in front, and that is Carroll Shelby standing on the corner.
I don't like to use "ribbon" type LEDs. These seem better: 3-light modules in plastic blocks with ounting screws and self-stick tape on back. About 3 inches long each. They cost about ten dollars for twenty modules.
http://www.amazon.com/gp/product/B00BG4T6EU/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1
I cut one off, as shown. I mounted it in the Ford dealership building about halfway up the back wall facing toward the ceiling, with na index-card sized piece of aluminum foil mounted on the ceiling above it, which dispersed the light more evenly.