led lights are efficient

Light Emitting Diodes ( l.e.dS )This Presentation is based on The Light Emitting Source..

Enlightening yours Life

CONTENTS..HistoryWhy its Implemented : Adverse Effect on EnvironmentIntroductionBasic Working PrincipleTypes Of ledConstruction of LedAnatomy Of LedLed DistributionConstruction Details & StructureLed Product & RangeComparisonsProposals & ConclusionApplicationsFuture TechnologyThanks' & Quires

HistoryIn 1962, when Nick Holonyak Jr. invented first visible led, emitting red light but they are not enough to illuminate surroundings.Hence used as Indicators, Seven segment displays like(calculators, watches, t.v, telephones etc..)By mid 1970s,more colors green, yellow were manufactured It got somewhat succeeded with improved efficiency.In early 1980s LED were being used for messages and other outdoor applications. They used less power and were ten times brighter than previous ones.By early 1990s High brightness LED packages were developed and were widespread used in Traffic lights.

Need to implement: EFFECT OF MERCURY ON THE ENVIRONMENT

One teaspoon of mercury can contaminate a 20 acre lake.

introduction

It is a semiconductor device that emits light when a current is passed through it.Instead of a filament they use a semiconductor diode which emits narrow-spectrum light.Depending on the composition & condition of the semiconducting material used (Silicone, germanium), they come in either Infrared for sensing heat, Visible for every day use, or Near-Ultraviolet for spotting stains at a crime-scene.LED consists of a chip of semiconducting material that has been doped with impurities in order to create a p-n junction.The wavelength and color of the LED depends on the band-gap energy of the materials forming the p-n junction.

Basic working principleWhen a PN junction diode is forward biased, the electrons and holes move in opposite directions.During this free movement, an electron may fall into hole releasing some energy.This energy is in the form photon and hence light is emitted.This phenomenon is termed as Electroluminescence.

TYPES OF LED

1. DIP LED 1. SMD LED

DIP LED(Dual Inline Packed) 2. SMD LED (Surface-Mounted-Device)CONSTRUCTIONAL DETAILS

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DETAILS:-LENSO-RINGSCREWSLEDSMC PCBHEAT SINKO-RINGPLUG HOLDERREPLACABLE PLUGCONSTRUCTION DETAILS:-

STRUCTURE OF AN LED BULB

Panels and down lights

T8 Retrofit Tubes and Fittings

High efficiency high bay fittingsFlood Lights for domestic and commercial applications

LED Surface Luminaires LED Product Range

A Comparison Between LED Lighting, Incandescent light Bulb and CFL

Carbon Dioxide Emissions (30 bulbs per year)

4500 pounds/year

451 pounds/yearClear Winner LED1051 pounds/year

1515

PROS AND CONS OF LED BULBSPROSInstant light without flickering4 times longer life time than CFL Not contains mercury and other hazardous materials so it can be recycle Very energy efficientCONSCostlier than ordinary bulbsThey are vulnerable to high temperature

applications

FUTURE TECHNOLOGIESOLED (Organic LED)Self powered LED bulbLED light can use as an alternative for wifi

This whole Presentation is Presented by:-Abhishek JangidElectrical Eng. (Final Year Std.)Roll No.:-12EAXEE702