I want to render mirror balls. In the real world you would hit each mirror ball with a spot light.
However, although you can see the direct spot light effect on the walls, the mirror balls show no light and no light is reflected onto the walls from the mirror balls.
What I would want to see is light on the other side of the wall (i.e. in the area circled in red) because that is the direction the second spot light is pointing, and directly perpendicular to the normal of a few faces of the sphere.
Why don't I see any light reflected from the balls?
Here is the project file: