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Epileptics and other light sensitives need not apply.
“The idea of a Visible Light Communication (VLC) network is nothing new and Li-Fi technologies have been in development for quite a few years, although commercial products are somewhat lacking. In simple terms, the LED lights flicker on and off thousands of times a second (i.e. too fast for your eyes to perceive) and by altering the length of the flickers you can introduce digital communications (like flashing a torch to send Morse code).”
https://www.ispreview.co.uk/index.php/2017/09/london-scientists-prep-10gbps-home-wireless-network-using-li-fi-5g.html