What if every light bulb in the world could also transmit data?

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At TEDGlobal, Harald Haas demonstrates, for the first time, a device that could do exactly that. By flickering the light from a single LED, a change too quick for the human eye to detect, he can transmit far more data than a cellular tower — and do it in a way that’s more efficient, secure and widespread.

Li-Fi is the label for wireless-communication systems using light as a carrier instead of traditional radio frequencies, as in Wi-Fi. With an advantage of being able to be used in electromagnetic sensitive areas such as in aircraft, nuclear power plants etc. without causing interference. Light waves cannot penetrate walls however, which makes Li-Fi significantly more secure relative to Wi-Fi.