Broadcasting Broadband Data Using Desk Lamps?

This is so stupid, like you could ever use a desk lamp for broadband. Wait. What? This is actually possible? Oops..nevermind.

The signal would be generated in a room by slightly flickering all the lights in unison. No one would be bothered by this because the rate of modulation would be millions of times faster than a human eye can see. Since visible light can't go through walls like radio, there would be no unwanted interference from stray signals and less worry of outside hackers.

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