In the 60' & 70's in the US I remember seeing fake Christmas trees turning on pedestals very slowly in windows of stores. My dad even had one year, I also remember the tree falling off to once or twice. The idea is a very good one. One light off to the side of the plant will provide deep penetration and good light coverage. I just have not seen them in years.

Yes there are movers, track and circular movers on the market. But if you could build something or buy something, you could have one light 16" to the left of center and above the height of the plant. And one light 16" to the right and middle foliage you would give the plant great light penetration everywhere. As the plant turns it gets flooded with light. It will grow larger and bigger buds then lighting from the top only ever will. The yield will increase as well due to the fact that the lower parts of the plant will receive as much light as the tops and that's always a good thing.