Researchers have already
figured out how to turn an array of LED light bulbs into a wireless data network. Now they’re using them to “print” invisible data onto physical objects. Brilliant minds at Fujitsu have figured out how to use an LED lamp as a sort of replacement for QR codes. Fujitsu’s lamp sends a stream of zeroes and ones by varying the intensity of the red, green, and blue LEDs. The fluctuations don’t need to be dramatic, either. Small changes work just fine, and they’re virtually undetectable to viewers. It’s pretty much the same way Li-Fi transmits data among devices.
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