How can light bulbs be smart? Could LED light bulbs really be used for wireless data communication? Here at the Li-Fi Centre at the University of Edinburgh, we are developing the electronics to make this happen. We will show you how Li-Fi will complement existing Wi-Fi networks to give you better service. Li-Fi will be a central part of future hybrid networks in homes, schools, offices and smart cities, and there will be new Li-Fi networks for aeroplanes, hospitals, even for communication underwater. We will also explain how it is highly energy efficient.