Just noticed that Cee had this challenge, and it so happens that I was on a photo walk in London last evening. I have something that shouts lights, so here goes.
These images were taken outside a building near Cannon Street station. The whole interior wall facing us was lit from behind, controlled by a man with a remote control, a very colourful spectacle with the wall appearing quite amazingly vibrant. It was quite entertaining, watching the colours of the wall change in an instant!