These are the "cans" used for the house lights at the Edward R. Murrow High School in Brooklyn, NY.
This is a 250watt lamp that is used for the house lights.  murr017
The top of the ceiling. You can see two house light cans connected via conduit.  murr018
The catwalk in the cove.  murr019
Can you say code violation? This box should be covered. ON the left we see conduit coming into the junction box. Hanging from the bottom are four circuits.  murr020
 This is what's above the ceiling  murr021