Elevator

This is an elevator at the Music Center in LA. The architecture is beautifully lighted. It has light bands and shadow bands on top of each other. I guess they did it by putting light on the horizontal pole/beam?. There are four sections, and the light can only reach about 1/3 of each section from the beam below, which creates the light and shadow strips. It is hard to see where the lights are. The designer hides it well to blend with the architecture. When I walk closer to the elevator, I can see light tubes wrapped on the beam. My guess is that it is not florescent light, but not sure what light it is…