1. GALGOTIAS COLLEGE OF ENGINEERING
& TECHNOLOGY
SEMINAR-1 (REE-554)
Submitted to:
Mr. Sudhanshu Mittal
Dr. Mohammad Shahid
Submitted by:
Name: VISHAL GUPTA
Branch:EE-3rd year
Roll No:1709720058

2. LED LIGHTNING
THE FUTURE IS NOW
SAVE MONEY.SAVE ENERGY.IMPROVE LIGHTING QUALITY

3. CONTENTS
•EVOLUTION OF LIGHTNING
•DEFINE EFFICIENCY
•WONDERS OF LED
•HOW LEDS ARE DIFFERENT
•IMAGES OF SOME LED LAMPS
•COMPARISON
•ADVANTAGES
•APPLICATIONS
•REFERENCE

4. EVOLUTION OF LIGHTNING
Incandescent bulbs, which are
now considered as “heaters”,
generate 95% heat and
accidentally give out light.
Fluorescent tube
light ( T12 SERIES)
CFL’s (5W , 9W ,11W)
LED’S( RED ,
, GREEN , WHITE)
ORGANIC LED

5. FLUORESCENT TO
LED’SFluorescent tube lights
have been therefor years
and would continue to
be in use for the next
couple of years
Fluorescent tube light’s
major draw back is that
they contain mercury
which is non-
biodegradable
Fluorescent tube
light also emit UV
radiations

6. ORGANIC LED
An Organic Light Emitting Diode (OLED), is a Light Emitting Diode (LED) whose emissive electroluminescent layer
is composed of a film of organic compounds. The layer usually contains a polymer substance that allows suitable
organic compounds to be deposited. They are deposited in rows and columns onto a flat carrier by a simple
"printing" process. The resulting matrix of pixels can emit light of different colors.
Such systems can be used in television screens, computer displays, small portable system screens such as cell
phones and PDAs, advertising, information and indication. OLEDs typically emit less light per area than inorganic
solid-state based LEDs.

7. DEFINE EFFICIENCY
• How well you can convert one thing to another
• In lighting we convert ELECTRICITY into LIGHT
• What is ELECTRICITY?—(Watt) Energy from (Wind power, solar ,fossils)
• What is LIGHT?—Energy that causes a visual sensation to humans
• LUMENS , CANDELA, LUX
• So we are converting one form of energy to another
• Efficiency is comparative tool, Not an absolute measure

8. WONDERS OF LED
A Light Emitting Diode (LED)
is one of the latest inventions
and is extensively used these
days. From your cell phone to
the large advertising display
boards, the wide range of
applications of these magical
light bulbs can be witnessed
almost everywhere.

9. WHAT IS IT
As is evident from its name, LED (Light Emitting Diode) is basically a small light emitting device that comes
under “active” semiconductor electronic components. It’s quite comparable to the normal general-purpose
diode, with the only big difference being its capability to emit light in different colors.
Working Principle:
It is a p–n junction diode that emits light when activated. When a suitable voltage is applied to the leads,
electrons are able to recombine with electron holes within the device, releasing energy in the form of
photons . The material used in LEDs is basically aluminum-gallium-arsenide .

10. HOW LEDS ARE DIFFERENT
LED lighting is very different
from other lighting sources
such as incandescent bulbs
and CFLs. Key differences
include the following:
Light Source: LEDs are the
size of a fleck of pepper, and
a mix of red, green, and blue
LEDs is typically used to
make white light.
Direction: LEDs emit light in a
specific direction, reducing the
need for reflectors and diffusers
that can trap light. This feature
makes LEDs more efficient for
many uses such as recessed
downlights and task lighting.
Heat: LEDs emit very little
heat. In comparison,
incandescent bulbs release
90% of their energy as heat
and CFLs release about 80%
of their energy as heat.

12. SOME LEDS

13. COMPARISON

14. ADVANTAGES
• Tremendous energy savings up to 90%
• Over a lifetime , fewer light bulbs need to be used
• LED do not contain any hazardous materials and therefore
do not generate any wastes.
• LEDS light bulbs can be recycled
• LED light bulbs do not flicker , do not cause RF interference ,
are much easier on the eyes.
• LEDS can emit light of intended colour without using any colour filters as
traditional lighting methods

15. THE FUTURE OF LED
LED is the future
of lighting
the lumens/watt
of LEDs would
increase
Cleaner and safe
source of
lighting
the cost of LEDs
would further
reduce
Life of the LEDs
would increase
Organic LEDs
looks to be the
future for
displays

16. APPLICATIONS
IN MOTOR
VEHICLES AND
BICYCLE
LIGHTS
IN TRAFFIC LIGHT
IN INDICATORS ,
SIGNS AND
SIGNALS
IN DATA
DISPLAYING
BOARDS
IN
MEDICALS
DISPLAYING
BOARDS
REMOTE
CONTROLS
IN LIGHT
BULBS AND
MANY
MORE

17. REFERENCE
• Obtained from- www.slideshare.net/com
• Obtained from - https://www.stouchlighting.com/blog/the-historical-evolution-of-
lighting
• Obtained from- https://energyfocus.com/blog/the-future-of-led-lighting/
• Obtained from- https://www.ledlightforyou.com/applications/index.jsp
• Obtained from- https://www.youtube.com/results?search_query=led+lighting++ppt
• Obtained from- https://www.currentbyge.com/ideas/8-advantages-of-led-lighting
• Obtained from- https://greenie-world.com/en/article/the-disadvantages-of-led-
lighting/