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What is LiFi Technology and how does it work?

Hello friends, today in this post we will discuss complete information about what is LiFi Technology and how LiFi works.

Friends, have you ever thought that there will be a technology that will provide internet service through light? Light will be used to provide the fastest internet service.

Yes guys, today we are going to discuss one such upcoming technology. This is LiFi technology; Which only bulb can run internet. To know more about Light Fidelity we request you to read this LiFi post carefully and in detail

What is LiFi Technology?

The full name of LiFi is Light Fidelity. It is a high-speed optical wireless technology. This LiFi technology uses visible light (light emitted from LED bulbs) to transmit digital data.

This technology works like WiFi. Although there are many differences between both WiFi and LiFi.

WiFi transmits data over radio waves, while LiFi uses Visible Light Communication (VLC) to exchange data. This technology works with LED light bulbs.

LiFi is an optical communication technology of Visible Light Communication. Where visible light rays are used. The range of this beam is 400-800 THz.

The data transfer speed in this technology is around 224 Gbps due to data transfer through light, which is about 1000 times more than WiFi. But this technology is not available everywhere. You can just stand under the light of a LiFi LED bulb and use this technology to download movies and videos within seconds.

Another advantage is that with internet service, your room will never be dark. When you turn on the LiFi bulb, the light will come out and the internet will come out.

Read more: How to Get Free Traffic or Visitors on your Website?

How does LiFi work?

LiFi works like all other internet devices. Before knowing how it works, you should know what ingredients are used in it. Mainly 3 components are used in this technology.

  1. Lamp driver
  2. LED lamps
  3. Photo detector

Another connection is required with these three elements; This is what we call the Internet. I have already given you a piece of information. That is, it transmits data through light.

LED bulbs have some features. It is the right material for LiFi as it has LED bulb light emitting diode and fluorescent component (Fluorescent Component).

Also, data in LED bulbs is transmitted at the speed of light, so LiFi requires high-speed data rates.

The light intensity of this LED bulb changes very quickly. The light is sometimes on and sometimes off. The human eye never sees these lights on and off. But the Photo Detector sees these. All these reasons make LED bulbs the best. To understand the functionality of LiFi you need to understand LEDs.


The lamp driver is connected to the internet source and transmits the information from the internet wire inside the LED bulb. Then, the light entering the LED bulb collides with the Photo Detector below, and the Photo Detector easily receives the change in light.

Li-Fi technology

Image by sentavio on Freepik

Now the Photo Detector converts the light signal into binary data. and sends it to a computer or smartphone for processing. Later it is converted into audio, video, and image. After that, we can see that data in the respective application.

Like the LED lamp through the lamp driver and then the data from the Photo Detector comes to the mobile. Similarly, the LED lamp can transmit the data from the mobile back to the receiver. It also works on two-way systems—sender to receiver and sender to receiver.

LiFi vs WiFi




Complete Form

Light Fidelity

Wireless Fidelity


The medium of Data Transmission is Light

The medium of data transmission is radio waves


LED Bulb

Wireless Router


There is no Interference Problem

There is an Interference Problem with Routers


Current IrDA compliant devices

WLAN 802.11a/b/g/n/ac/ad Standard Devices


It is commonly used for internet browsing in Airlines, Under Sea Exploration, Hospitals, Operation Theatres, Offices and Homes.

Internet access is done through WiFi Hotspots


Works in salty sea water and works in deep areas as interference is low

Interference is high so it does not work in salty sea water and less work in deep areas


Transmission is protected as light cannot travel through walls

Since the network is open, data transmission is not secure.

Data transfer speed

1 Gbps

150 Mbps+

Frequency of operation

10 times the Frequency of Radio Waves

It includes 2.4GHz, 4.9GHz and 5GHz

Coverage distance

10 Meters

32 meters (WLAN 802.11b/11g) depending on transmission Power and Antenna


Lamp Drivers, LED Photo Detectors and LED Bulbs

Wireless Router


Brief History of LiFi

Professor Dr. Harald Haas founded LiFi technology. The University of Edinburgh, UK enrolled him. He presented his innovation at Tech Talk. PureLiFi has Harald Haas as a co-founder. This thinking will enable us to use LiFi technology in the future today.

According to Harald Haas, we call it visible light communication (VLC) when we send information through the visible light component. Harald Haas initiated a D-Light project.

He devoted much of his time to the project from 2010 to 2012 while at the Edinburgh Institute.

The TED Global Talk demonstrated LiFi technology to the public in 2011. Then, people started to become aware of this technology. As a result, PureLiFi, a company, was promptly launched and it still exists today.

Previously known as Pure VLC, PureLiFi was an Original Equipment Manufacturer (OEM) company. To expand PureLiFi’s business, the company began collaborating with existing LED lighting.

In October 2011, the company joined other industry groups to establish the LiFi Consortium. Both groups aimed to develop High Speed Wireless Systems.

To overcome the limitations of radio waves, many AC companies started manufacturing Uni-Directional VLC products. However, this technology was very different from Li-Fi.

In 2012, LiFi demonstrated VLC technology. They proved this in a performance held in August 2013, achieving a data transmission rate of 1.6 gigabytes/second using Single Color LEDs of this technology.

A September 2013 press release stated that there is no need for line of sight in LiFi. An October 2013 report said Chinese manufacturers were working on developing LiFi kits.

Russian Company Stins Common Developed a wireless network called BeamCaster in April 2014. Currently, it has a data speed of around 1.25 gigabytes per second.

The speed of LiFi in the future is going to be 5 GB/sec. That was a short history of LiFi. You might like it.

Advantages and Disadvantages of LiFi

Like every technology, LiFi has both advantages and disadvantages. From the pros and cons comparison below you can find out if there is anything special about LiFi.


  1. Skills: You must know that this technology is based on visible light technology. And you know there are already LED bulbs in offices and homes. LED bulbs are a good source of light. For this reason, they can be used for data transmission. Moreover, it is very cheap and a good source of energy. But it is mandatory to keep the LED bulb on during data transmission. If you have problems with the light, you can dim the LED bulbs if you want and still use the internet.
  2. Accessibility: Where there is a light source there is internet. You will see light bulbs everywhere. Like home, office, shop, shopping mall and even in the plane. That means you can use LiFi wherever there is lighting.
  3. Security: One of the advantages of this technology is security. You know that light cannot pass through walls. Similarly, the signal of LiFi is also LiFi secure. Because no signal from one room is going to another room. So no outside user can access your internet.


  1. You cannot access the internet without a light source. Each time the light should be turned on.
  2. As the range is limited it can only be used inside a room.
  3. As light cannot penetrate walls. Due to this, the internet is restricted to limited areas.
  4. Internet speed is likely to be interrupted due to sunlight.
  5. A separate network must be created for new LiFi connections.
  6. It is a very expensive technology.
Parvej Alam
Parvej Alam
Hello, I'm Parvej, a passionate content writer with a love for crafting engaging and informative narratives. My journey as a wordsmith has been driven by a deep curiosity about the world and a desire to share compelling stories.

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