Led Lighting

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TERM PAPER:
Topic: Led Lighting

ECE201

TABLE OF CONTENTS
• Introduction
• History
1) Motivation
2) Design Question
3) Design Goals
4) Use Of Color
5) Interface
1. Touch Pad Dimmer
2. TCP/IP Network
6) Conclusion
• Holiday Light-Led And Fiber Optics
• A Note About Wiring
• Top ten reason to select led lighting
• Reference

Introduction- LED lighting fixtures offer endless colour changing possibilities to enhance your environment. The infinite colour palette ranging from pretty pastels to deep intense hues makes these products ideal for entertainment, architectural and retail applications. Transform a look, highlight a feature, create an atmosphere – the choice is yours. Colour mixing with the LED Range gives the architect an unlimited colour palette never before available in a range of lighting fixtures that can enhance building facades, water features and focal displays. Indoors or outdoors, the Wirpo LED range enables a new era of coloured light generation. It is indisputable that LED is the future of lighting. You can enjoy the convenience of this innovative lighting solution today. LED lights convert electricity to light more efficiently than any other mainstream solution today. They do not consume it to produce heat, as incandescent bulbs do, and last much longer, with new designs lasting over 50,000 hrs! This means fewer visits to the store to replace burned out bulbs. Coupled with the fact that they emit directional light, it is obvious that LED light bulbs are the smarter, leaner, greener choice.

HISTORY-
LED lighting started with extensive research in the early 60's. Texas Instruments, General Electric, & RCA Labortories were reserching and developing the technology. They discovered that miniture crystals (gallium arsenide) gave off infrared radiation when electric current was applied. That was and became the first (infrared) Light Emmitting Diode. Then came the first visable spectrum (colored-Red) Light Emmitting Diode. Light Emmitting material had been around since the early 1900's but not properly researched. Different forms of Gallium as well as other crystals determine the color of the LED.

Blue LEDs were invented in 1971. White, Green, Blue, UV, Yellow, Amber, and Yellow LEDs went into commercial production in the early 90's. Red LEDs have been used in scientific and indicator devices since the early 70's. Led is an acronym for light emitting diode the history of led goes back to 1907 with a form of electroluminescent material.

LED Lighting History
1907 - Light Emmiting Solid
1955 - Infrared LED
1962 - Red LED
1971 - Blue LED / 1993 production
1972 - Yellow LED / 90's production
1972 - Amber LED / 90's production
1995 - White LED / late 90's production
late 90's - UV LED / late 90's

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MOTIVATION-
• Emergence of LED’s as lighting source
– Energy efficient (see incandescent, fluorescent)
– Size and durability
– Versatility in application (color, control)
• “Super” bright LED’s in lighting experiment
– Variable color temperature
– Application as lighting + indicator source
– Exploration of fitting user interfaces

DESIGN QUESTION-
• Range of application for a lighting project? – Neither too narrow nor too broad!
• How many LEDs are sufficient?
– Flashlight ~ 3; 7 ft2 Video Panel ~ 13,000
• Role of color?
– An alternative to RGB?
• User control?
– What level and granularity?

DISCLAIMER-
• Mostly
experimentation
• Some theory
• Little proof

DESIGN GOALS-

• Lighting comparable to desk lamp
– Illumination of typical desk surface area
– Two light heads...
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