Best mini LED spotlight for Lego display case?
I'm not sure exactly how many lights you are looking for, or the exact effect you are trying to create, but you may be able to get what you want using individual LEDs:



These have a diameter of 5mm, so the nose is able to fit snugly into an antistud. I've used them successfully in Technic holes and Erling bricks. The main advantage here is that you can actually brick build whatever lighting you would like to use, or just integrate this into the main model.

Here's an example of using these with Erling bricks that I saw on Eurobricks:



If you aren't comfortable wiring these up yourself, you can buy them prewired with a controller from LifeLites.

If you would like to be a purist, you could also use a number of the PF lights (8870), as they are roughly the same as using 5mm LEDs. PF lights are 3mm LEDs encased in plastic so that they fit snugly into Technic holes.