Plus, everybody can "suck at your light" to get your private information...

Thanks to the US congress Light bulbs are to be banned from manufacture and use. The US is now a police state under Obama and the Democrats.

This problem solved decades ago with Manchester Encoding, e.g. used with Ethernet CSMA/CD

don't send too many zeroes all at once, or lights go out..

As Boris said this isn't new, not only was there an EU project doing this
http://www.ict-omega.eu/
but in 2008 boston university was trying it also.
As for the details of this project Morley asked about, here's the TED talk of the fellow mentioned in this article:
http://www.youtube.com/watch?v=NaoSp4NpkGg

BTW, since the EU/US is generally slow on this they should try to get an asian country to trial this, a good place would be in the subway since there it can be hard to get wifi going but there are also always lights on!
Plus an asian country could quickly mass produce dongles for people's devices.

"In this case there are 1.4 million base stations boosting the signal but most of the energy is used to cool it, meaning it is only five per cent efficient."

That sounds very much like a description of incandescent light bulbs, not of wi-fi access points. Could you please clarify? I am trying to determine if it's the alleged boffin who's full of used cattle feed, or yourselves.

...wow, slow news day chaps??

http://www.engadget.com/2011/08/01/german-geniuses-hit-800mbps-with-light-bulb-wlan/