A couple of thoughts.

1. Do you absolutely need to use fluorescent lamps? At about 20W each that's a lot of current to pass through slip rings (not to mention being at line voltage.) Can you use LED instead, maybe 12V strips? That would be safer.

2. Rather than use a slip ring, would it be feasible to have a single contact at each end of your shaft?

3. If your light column oscillates, could you use a coiled wire like a steering wheel does? Then you don't need a slip ring.

That said, slip rings generally aren't designed to take a lot of thrust or side loading (at least, not the inexpensive ones.) You'll need to deal with that in the fixture separately.

A couple of thoughts.

1. Do you absolutely need to use fluorescent lamps? At about 20W each that's a lot of current to pass through slip rings (not to mention being at line voltage.) Can you use LED instead, maybe 12V strips? That would be safer.

2. Rather than use a slip ring, would it be feasible to have a single contact at each end of your shaft?

3. If your light column oscillates, could you use a coiled wire like a steering wheel does? Then you don't need a slip ring.

That said, slip rings generally aren't designed to take a lot of thrust or side loading (at least, not the inexpensive ones.) You'll need to deal with that in the fixture separately.