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In this modern day of Technology, Internet,  everyone’s life. The number of devices accessing a network is increasing, which leads to complexity in network traffic and a shortage of bandwidth. To overcome this problem, a new concept of superfast wireless technology has been introduced known as LI-fi. Li-fi stands for Light fidelity, invented by Harald Hass. Li-fi is a wireless communication technology that transmits high-speed data via Light Emitting diodes (LED’s).

Most households will have a broadband connection, and lots of those houses experience connection or speed issues. Li-fi has almost no limitations on capacity as the visible light spectrum is 10,000 times larger than the entire radio frequency spectrum used by wi-fi.

Li-fi could make a huge impact on the Internet of Things with data transferred at a much higher level, and even more, devices will be able to connect to each other. Thus, LED bulbs in our home and workplace will work as a router just by placing a transmitter modular.

Efficiency and safety of the internet are the dominating issues now. Li-fi is designed to overcome the disadvantage of WiFi. The four key criteria that are used are: the LiFi can operate within a complex physical environment, the system can provide the bi-directional communication, traffic and security information can be pushed to smartphones, a system of audio-messaging is developed to enable tourist and people to be guided.

For security, LiFi is tougher than a WiFi. It is because the coverage area of LiFi is only on their illuminate area. The signal of LiFi cannot go through the wall. While the signal of WiFi can go through the wall, it can cause the vulnerabilities in data loss and data leakage.

In the future, the work can be done for analyzing the security threats based on the architecture, communication, and implementation of LiFi according to CIA triad concept.

It’s likely that the two technologies will exist side by side over the coming years.

How does it work?

Li-fi and wi-fi are both similar to both transmit data. Wi-fi uses Radio waves while li-fi will use light waves. The basic concept for working principle in LiFi Technology is pointing into Transceiver and Light as a media transmission.

With li-fi your light bulb is essentially your router. In a digital transmission system, data will we converted into binary bits in the form of 0’s and 1’s equivalent to ‘on’ and ‘off’ states. Visible light is an ultra-fast electromagnetic wave.

An LED light bulb is a semiconductor light source means that the constant current of electricity is supplied to an LED bulb can be dipped and dimmed, up and down at very high speeds, without being visible to the human eye. The tiny changes in the dimming of LED light bulbs are then converted by the ‘receiver’ into an electrical signal. After that, the signal is then converted back into a binary data stream that we would recognize as web, video, and audio applications that run on internet-enabled devices. Li-fi technology is very fast. Li-fi is a high-speed fast and cheap version of wi-fi.

Data is fed into an LED lightbulb using signal processing technology. The lightbulb sends data to a type of photodetector called a photodiode. The photodiode converts the data into an electrical signal. That signal is then converted back into a binary data stream that can be read by internet-enabled devices.

Why we need Li-fi?

  1. Li-fi technology is based on various kind of light.
  2. Wi-fi cannot use underwater, but li-fi can be used underwater.
  3. Li-fi is cheaper for data transmission process.


 Li-fi technology will save cost in our homes. It could be done without electronic devices such as routers, modems, signal repeaters, wave amplifiers, and antennas.

  1. Scalable network
  2. Multiple device support- many devices without any limit.
  3. Highly energy efficient solutions.
  4. High-security data transmission.
  5. It will also be useful in that area where radio waves do not reach.
  6. No interference like traditional radio waves.
  7. It is easy to install.
  8. In the world, every light be replaced by LED and will act as free data hotspot.

Real life applications of Li-fi

  1. Li-fi provide internet access to pedestrians.
  2. It also helps in improving real-time traffic updates with the traffic light and Li-fi enriched vehicle headlights.
  3. Airline passengers can access high-speed internet using Li-fi without causing any hazard to the signals received by the plane.
  4. It will help customers to easily get more information about the products and finding their way in the store.
  5. Traditional Wi-Fi cannot be used underwater because radio waves get absorbed by the water. Li-Fi, on the other hand, uses light for data transmission. Visible light can prick deep into the water, and therefore, it can be used for underwater communication.
  6. Cellular network signals are dangerous in petrochemical plants due to the antenna’s ability to cause sparks or electrical explosions. LED li-fi lights do not pose the same risk and will be able to provide internet access to these type of environments.
  7. It can be used in Healthcare and Hospitals for better treatment of patients.
  8. It gives data communication option for future 5G and IOT networks.


  1. Device must be compatible. Li-fi signals cannot pass through walls, so for full connectivity, capable LED bulb will be needed throughout the home.
  2. It does not go when it comes to a public wi-fi network because when there is a lack of light bulb, there is a lack of Li-fi internet.
  3.  Li-Fi does not work under the direct sunlight because the sunlight blocks the path of the ray of light given by the LED lamp.
  4. It doesn’t work with the LED lights turned off. This could limit the locations and situations in which Li-Fi could be used.


Li-fi technology is still unknown to many people, and it is beyond imagination for some people. Li-fi is efficient, fast, and cost-effective. It will be available to common citizens shortly. A great change in life will happen if Li-fi technology replaces wi-fi technology.

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