I don't care for the look and color of solar and they need to be in good sunlight to regenerate themselves. There are high end low voltage which I have. I do believe there is a solar feed that can be placed in the sun to feed the solar lights in the shade but they still generate a very faint purplish color light.

No, you can just slip the globe on the old light and have it work. They are two completely different systems and arrangements.