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This is Scientific American's 60-Second Tech. I'm Larry Greenemeier. Got a minute?

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Here is a bright idea: instead of radio waves, use light to get online.

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Unlike wi-fi, or wireless fidelity, so-called "li-fi" transmits data through variations in light intensity.

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Researchers in China recently showed that, using a one-watt LED bulb, li-fi could connect four computers to the Internet at data transfer rates up to 150 megabits per second.

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Earlier this year, German scientists sent data at three Gigabits per second using LED lamps, in controlled conditions in their lab.

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They later demonstrated 500 megabits per second speeds in a real-world setting.

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Most wi-fi connections don't even come close to 100 megabits per second.

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Li-fi has drawbacks.

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The technology works only when the LED's light can reach the gadget.

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Stray from the LED, and you lose your connection.

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On the plus side, the visible light spectrum can handle way more traffic than wi-fi's already crowded radio spectrum.

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And any LED bulb can be a network connection.

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We may someday look back at wi-fi as technology from the dark ages.

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Thanks for the minute, for Scientific American's 60-Second Tech. I'm Larry Greenemeier.

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