Solar Light Tube

[PeteGod]

Does any technology exist where you could mount an outside light refractory(?) on the roof of a building to "catch" sunlight then transmit this light through a flexible light tube that could be run throughout a structure to provide 30 foot/candles (or so) of lighting during sunlight hours? The light tube could be draped through the roof joists of an industrial/commercial structure to provide primary or secondary supplemental lighting.  It would be much light a glow stick attached to a flashlight except it would be 2" or so in diameter and not encased so that the whole tube lit up equally from one end to the other.  The light tube would/could be up to several hundred feet in length.  The rooftop refractory could be round (8' in diameter) and 8' high with the light tube in the middle catching a concentration of sunlight and transmitting it into the light tube that would run inside the structure.

The applications would be innumerable.  I buy, own, manage and renovate older industrial structures and if possible, this would be an incredible source of "free" lighting.