I must've seen something on this in an article on a zero-emissions building in California. There was indoor lighting that utilized solar concentrators and fiber optics to channel light indoors so that electricity wouldn't have to be used during the day.
Out of curiosity, I wanted to find out how much it costs, because that'd be pretty sweet to use in my new house. I googled "fiber optic lighting basement sunlight" and came up with a few interesting links. Unfortunately I still don't know how much this stuff costs—other than it's likely outside my price range.
Sunlight inside no direct-sunlighted rooms
Simple and bright, heliostats tap sunlight for lighting outdoor and, increasingly, indoor spaces
Sunlight Direct Hybrid Lighting: Install It, Get a 30% Federal Tax Credit
Hybrid Lighting Promises Cool, Efficient Light and More...
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