2. WHAT ARE LEDS
LEDs are used to illuminate an area
It uses multiple chips inside fixture to
produce white light
Blue LEDS are typically covered with phosphor
coated lens which results in white light
3. The LED consist of a chip of semi conducting material
doped with impurities
When voltage is applied electrons and holes flows in to
PN junction
The Electrons and holes recombine and releases energy
in the form of light
PHYSICS OF LED
4. WHY LED
Long life greater than 10 years
High efficiency (102 lm/W)
They generally consume 80 % less power
than incandescent lamp and 50% of CFL
12 W LED can replace 65 W incandescent
7. ENERGY CONSUMPTION IN INDIA
One fifth of electricity consumption in India is
Through lighting
About 400 million light points in India today are
lighted by incandescent lamps their replacement
With LED lights would lead to a reduction of over
10,000 MW in electricity demand
8. APPLICATIONS
• Automotives head lamps
• Traffic signals
• Solar led street lights
• Horticulture for plant growth
• Domestic lighting
10. LIGHTING TRENDS
• They last longer
• Cost effective
• Energy efficient
• These bulbs emit no toxic gases
• Small in size
• Easier to design
11. CONCLUSION
• LEDS are expected to be the primary domestic
• light sources in the near future
• This leads to enormous amount of energy
• saving process
• Solar lighting system such as lanterns ,street
• lights,home lights etc can be effectively used
