Harald Haas's research seems to look at Optical wireless communication. Generally, the best way to describe how a typical LI-FI situation might work is LED light bulbs attached to the ceiling of an area. An individual with a wireless device and some kind of optical receiver can gather and receive data from the LED bulbs.
http://www.see.ed.ac.uk/wordpress/hxh/
I wonder how having LI-FI would affect the environment. Would there be a lot more light pollution? On the side note would you need stronger lights to send data over longer distances and therefor affect the environment even more?
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