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