You may remember that a few months ago I went to see the newly restored Enterprise model at the Smithsonian Air and Space Museum. I was disappointed that the model's new lights weren't on when I visited. Well, last week I went back.
My understanding is that they turn on the lights only twice a day, at 1PM and 3PM. I don't know for how long they stay on, so if you go, get there on time. It's definitely worth seeing live.