Basic6 has an awesome system of LiFi-based geolocation for retail stores and museums. You can see it in action in this video here from CES: 

As a customer or patron carries the device around a space, the lights send data that updates the device with his specific location. Light offers several advantages to radio waves in this implementation—it's more secure, and offers a much higher degree of precision. The specificity of the data is controlled by the shape of the cone of light.

Unlike beacons, which project, invisibly, in a nebulous globe, the range of the light network can be seen, and controlled. This makes setting up the system a lot more predictable. 

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