Without making any normative arguments: if you’re in a position (industrially and technologically) to disassemble the sun at all, or build something like a Dyson swarm, then it’s probably not too difficult to build an artificial system to light the Earth in such a way as to mimic the sun, and make it look and feel nearly identical to biological humans living on the surface, using less than a billionth of the sun’s normal total light output. The details of tides might be tricky, but probably not out of reach.
Without making any normative arguments: if you’re in a position (industrially and technologically) to disassemble the sun at all, or build something like a Dyson swarm, then it’s probably not too difficult to build an artificial system to light the Earth in such a way as to mimic the sun, and make it look and feel nearly identical to biological humans living on the surface, using less than a billionth of the sun’s normal total light output. The details of tides might be tricky, but probably not out of reach.