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If your harnessing this much power and you require a beacon of light surely you could do better than using a boring old star through a slit...
You could beacon at a specific wavelength of light, send complex messages from an array of lasers maybe, heck you could make the star look like a disco ball if your tech is that far advanced.
Originally posted by Astyanax
In order to remain functional and habitable, the sphere would have to radiate into space the same amount of energy as its parent star would if unenclosed.