There are multiple problems with LiFi. The most obvious being diffusion and diffraction as well as line of sight (you need a bright light very close to your device). But also LiFi relies on there being essentially zero power fluctuation in the actual lights. This might be possible in a tech demo where the lights were on for 5 minutes, but not for lights that have seen several months of use.<p>Not to mention that the power costs are immense (only a fraction of the power of LiFi is actually spent on data, the rest is actually powering an array of lights).