If the light is in the center, and the lazy Susan is moving the whole base that the plants are on, then the plant's orientation to the light will never change even as the lazy Susan rotates.
About the "center light" I mentioned in "Plan B". The center light would be "off-set" a little, just enough to allow the light-to-plant orientation to change as the Lazy Susan rotates. See post #9.
Am I missing something here? Is each plant on a lazy Susan?
One Lazy Susan, mutiple plants.
Personally will 4ft diameter to work with I'd drop a couple bulbs dead center, one on top of the other, and that's it. Grown the plants up the walls. Check out the vert section.