Light Fidelity Technology (LiFi).
                     LIGHT FIDELITY 
TECHNOLOGY (LIFI)
WHAT IS LI-FI 
TECHNOLOGY?
• Li-Fi (Light Fidelity) is 
like Wi-Fi (Wireless 
Fidelity) but uses light 
for data transmission 
instead of radio waves. 
• It uses solid-state 
lighting (SSL) such as 
LED bulbs. 
Source: www.jagranjosh.com
VISIBLE LIGHT 
COMMUNICATIO
N
• It facilitates the wireless 
method of data 
transmission through 
Visible Light 
Communication (VLC) 
technology and can be 
up to 100 times faster 
than Wi-Fi. 
Source: www.jagranjosh.com
VISIBLE LIGHT 
SPECTRUM
• Li-Fi uses visible light. This 
indicates that Li-Fi has a 
wider range of available 
frequencies as the visible 
light spectrum is 10,000 
times larger than the entire 
radio spectrum. 
• It covers frequencies from 
430,000 to 770,000 GHz 
and colours from near-
ultraviolet to near-infrared.
Source: www.jagranjosh.com
ADVANTAGES OF 
LI-FI
• Li-Fi can pass through 
salty seawater as light 
can travel through 
water. It has less 
interference.
• It can work in the dense 
region. 
Source: www.jagranjosh.com
APPLICATIONS OF 
LI-FI
• It is used in airlines as it 
will not interfere with 
the equipment on the 
aircraft that relies on 
radio waves such as its 
radar.
• Li-Fi is used in undersea 
explorations as light can 
travel through water.
Source: www.jagranjosh.com
APPLICATIONS 
OF LI-FI CONT.
• It is used in operation 
theatres in the hospitals 
as light waves have little 
effect on medical 
instruments. 
• It is also used in offices 
and homes for data 
transmission and 
internet browsing. 
Source: www.jagranjosh.com
PROS OF LI-FI
• Speed: Light spectrum is nearly 
10,000 times larger than the 
spectrum occupied by radio waves 
thereby carrying more information 
100 times faster than Wi-Fi. It can 
transmit data at a rate of 224 GB per 
second. 
• Efficient and Cheaper: Li-Fi is more 
efficient and cheaper than Wi-Fi due 
to the nature of LED bulbs. It will 
save costs in homes and workplaces 
as it can work without electronic 
devices such as routers, modems, 
and so forth. 
Source: www.jagranjosh.com
PROS OF LI-FI 
CONT.
• Security: Radio waves can be 
intercepted by people outside 
your network as they can 
pass through walls, 
compromising the security of 
your data. 
• Availability: With Li-Fi, every 
light source can facilitate you 
with the internet. Once the 
technology is available to the 
general public, it can be 
accessed via streetlights, 
building lights, and so forth.
Source: www.jagranjosh.com
CONS OF LI-FI
•  Limited Range: As light 
cannot penetrate through 
walls, it is good with the 
security point of view, but it 
provides a limited range. Thus, 
Li-Fi can be effectively used in 
closed spaces. In open spaces, 
Wi-Fi's coverage can go up to 
32 meters as compared to Li-
Fi. 
• Limited Compatibility: As 
technology is new, not many 
devices are compatible with it. 
Source: www.jagranjosh.com
IMPORTANCE OF 
LI-FI
• Li-Fi can be applied in 
traffic control systems 
using a car’s headlights or 
in chemical manufacturing 
plants where radio 
frequency is too 
dangerous.
• With Li-Fi, the spectrum 
can be utilized more than 
1000 times greater than 
the entire spectrum used 
for radio frequencies. 
Source: www.jagranjosh.com