LED (light emitting diode) is a semiconductor device that emits light when electricity is passed through it. It has several advantages over traditional light sources like incandescent bulbs - it is more durable, energy efficient, and long-lasting. The document traces the early history of LED development from the 1960s to recent widespread adoption in indoor and outdoor lighting applications. Key benefits highlighted include energy savings, lack of heat/UV/IR emission, long life, durability and recyclability. Common uses discussed are in signage, video displays, indoor/outdoor lighting, and future potential applications.

1. Mohammed Mohasin Shaik
www.shaikmohasin.wordpress.com
LET ME
Know “LED“

2. Light Emitting Diode, a semiconductor diode that glows
when a voltage is applied. It is also called as
semiconductor light source that converts electrical energy
into light energy. LED is a tiny light source that fit easily into
an electrical circuit.
they do not have a filament that will burn out.
What is LED ?

3. Short History
 The LED started life in October 1962 by Nick Holonyak Jr, as a single red illumination in a
General Electric research lab in New York state.
 Monsanto develops the first commercially available LEDs for HP35 Calculator
 In 1976 – T.P.Pearsall creates the first high-brightness high efficiency LED’s for optical fiber
transmission wavelengths.
 In 1980 – LED development continues along the lines of increasing light output while
maintaining efficiency and reliability.
 In 1997 – Nicha Corporation develops the first high brightness Bluish-Green and Blue LED’s in
the world.
 Philips Lumileds introduced power LED’s capable of continuous use at 1watt in 1999. These
LED’s used much larger semiconductor die sizes to handle the large power inputs.
 Now : The LED lighting revolution begins with the first official standardizations of LED’s and
LED fixtures in many international countries. People are widely pay attention to this energy
saving technology and LED lighting begin to flowering all over the world in peoples indoor
and outdoor life.

4.  Dimmable
 Environmental Friendly
 Directional
 Energy Efficient
Why LED ?

5.  No Heat
 Quick Start
 Long Life
 Low Power Consumption
Why LED ?

6.  No UV
 No Noise
 No IR
 No Mercury
Why LED ?

7.  Long Life – 50,000
 Durable
 High Energy Efficient – Example : 120W = 250W
 Easy Installation
 Lower Maintenance
 Recyclable
 Good Visibility
 Quick Start – Quick Off
Key Features & Benefits

8.  Fresh Food
LED keep food fresh for longer
 No Bugs
LED do not attract bugs
LED Cool Facts

9.  Where maintenance is frequent
 Where there is need to reduce energy
 Where areas need better visibility
 Where areas need instant on illumination
Where to consider LED ?

10. “ EVERY WHERE “
Where we see LED’s

11. LED Indoor Applications
Indoor lighting is usually
accomplished using light fixtures,
and is a key part of interior
design.
LED can save energy in place of
using traditional lighting, which
represents a major component of
energy consumption in buildings.

12. LED Outdoor Applications
Outdoor lights are used to light
roadways and walkways at night.
LED and photovoltaic luminaries
to provide an energy-efficient
alternative to traditional street
light fixtures.

13. LED Signage
In the old days of variable
message signs which used
incandescent bulbs . Now trend is
LED .
LED Signage makes a grand
look , environmental friendly ,
visual branding and save energy.

14. LED Video Display ,
Signals & More..
A LED display is a video display
which uses light-emitting diodes.

15. The Future

16. - Mohammed Mohasin Shaik
From traffic lights to Christmas lights and even more office lighting , roadway
lighting also home lighting, light-emitting diode lights are an energy-efficient
alternative to traditional incandescent or compact fluorescent lights and are
used in an increasing number of applications day by day.