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Compared to the standard LED bulbs actually used, their VLC system is a black box - there is an LED and photodetector in front, and the rest of the network connection and Ethernet interface are hidden behind the box.
In order to reach 3Gpbs, HHI researchers have found a new way: no longer use only one LED light, now there are 3 colors. It is not clear whether the transmission range of this new technology has changed from the past, but it is likely to be the same. Tested in the environment of the pavilion, 3Gpbs became 500Mbps, and the speed is still very fast.
In theory, LiFi (visible light communication) can incorporate any LED light into the network connection. LiFi transmission is also in a very high frequency (several hundred hertz), far beyond the tightening of fixed antennas and wireless spectrum and policy licensing. For the same reason, LiFi can be widely used in those with radio frequency interference. Places such as exhibitions and places where RF interference is prohibited, such as in hospitals or on airplanes.
HHI researchers claim that visible light communication improves your privacy. Because in theory, your signal is easily covered with opaque material, you can prevent others from snooping.
It is very special in the use of the scene, such as the communication of ultra-high-speed short-distance transmission to the car through street lamps... These technologies are becoming more and more mature, and it is really only a matter of time to hope that LiFi becomes a reality.
It is understood that the conventional visible light communication system can realize data transmission at a speed of 500 Mbps within a range of 4 meters, or transmission at a speed of 120 Mbps within a distance of 20 meters. 
LED lights are included in the network connection: data transmission achieves 3Gb per second
Recently, the Fraunhofer Henrich Hertz Institute (HHI) in Germany announced the successful use of ordinary LED bulbs in the laboratory environment, successfully achieving 3Gbps data transmission speed. In real life scenarios (such as exhibitions), this system can also reach 500Mbps. speed.