Uplifting News
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Aren't you just describing fiber optic cables?
Similar concept, except using mirror-walled empty tubes instead of strands of clear fiber. It's not for transmitting data, just distributing natural light.
Fiber optics transmit data through the medium of light, not electricity. It is exactly the same thing. The inside of the fiber optic cable is reflective and works just like a tube of mirrors. https://en.wikipedia.org/wiki/Fiber-optic_communication
I have seen at least plans, and I think it's actually been done, for using fiber optic cables connected to a skylight to transfer sunlight to rooms that otherwise wouldn't be able to have any.
Nothing about fiber optic cables are about data specifically. It's just a cable that transmits light in a very similar way a tunnel with mirrors would (but better). It happens to be very useful for data, but it's just sending light through it that's interpreted as data at the other end.