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This is pretty cool that it is now possible to use visible light to transfer data like video and audio. If they also add a solar charging panel onto the phone it can also charge it at the same time. Plus, the light can be used to light the room.
Light also seems more reliable then Wi-Fi since Wi-Fi sometimes disconnects, and a short range compared to light which can be longer if the light is bright and visible.
Light also seems harder to hack then Wi-Fi since light stays inside your home, and not outside if you have curtains, and you notice if someone was using your lights inside your house to hack your internet.