It is true that LiFi technology causes light to flicker but this happens at such a high frequency that it is invisible to the human eye.
The most asked questions about LiFi below
Yes. Since the light that comes from the sun is constant, the highly sensitive receivers are able to distinguish between the light coming from the sun and the flickering, modulated light coming from the LiFi light source.
We have developed two-way communication links between our light source and the user terminals. This means that we are able to send information for the users to download, and also allow these users to upload information back to the LiFi lamp. The technology we’re developing not only allows this to happen faster, additionally it operates with greater security and without interference.
For LiFi to work, we need light. Therefore, if the light source is completely turned off, there will be no LiFi. However, LiFi can be enabled at dimmed visible light levels that appear dark but are high enough to transmit data. LiFi can also work when visible light sources are completely turned off and infra-red lights are used which are not visible to the human eye.
In order to use LiFi, the receiver has to be below a LiFi-enabled light source. If we were to have this light source in a room with no windows, there would be no way for the light source to leave the room, making it much more difficult to hack the system. WiFi, on the other hand, travels through most walls and doors, allowing potential hackers to access the network from a neighboring building or room.
Since we are also able to encrypt information emitted via LiFi signals, we can further increase the security levels of our light communication.
The simple answer is yes! Since LiFi uses an existing light source, it requires almost no additional power to transmit data. Once lights are turned off, WiFi would be needed to communicate. However, only about 2% of WiFi power is transmitted by the radio, making it a very inefficient communications device.
The LED technology which LiFi uses is also much more energy efficient than most contemporary light sources. Adopting LiFi technology will help the world drastically reduce energy consumption, beyond communication power alone.
No. Light doesn’t only travel directly from the source, it is also reflected off surfaces. For LiFi to work, it is more important that it has a qualitative signal, rather than a direct signal. If the signal that is reflected off the wall is qualitatively high enough, there is no need for a direct light signal from the source.
Currently, LiFi technology has reached speeds of around 100mbps and is improving rapidly. These speeds are already exceeding what WiFi is realistically offering. An additional problem for WiFi is that its bandwidth is nearing exhaustion, while the light spectrum is still freely available. Rapid improvements in LiFi technology and its hardware components mean there is still huge scope for improvement.
No. Excellent results have been achieved using normal LED light sources.
LiFi wasn’t developed with the idea to completely replace WiFi, rather to provide efficiency in areas where WiFi showed limitations. Hospitals and certain industrial settings are good examples of this, but other areas where WiFi is not easily accessible (such as underground stations) are great application areas as well.
Since it uses the light spectrum, the potential speed, security and bandwidth upsides make LiFi an increasingly interesting communication medium compared to the existing WiFi technology.