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History and Technologies Used Behind LED Lights

Thomas Alva Edison was an American inventor who invented one of the greatest long-lasting electric bulbs. With the time, technology upgraded and nowadays, we use LED Bulb (หลอด ไฟ led, which is the term in Thai) lamps. It has a greater life span than most of the normal bulbs and is significantly more efficient than other fluorescent lamps. And it requires an LED circuit to operate with 200 lumens.

History of Bulb

The first low-powered LEDs were developed in the early 1960s, and can only emit light in low red frequencies of the spectrum. In 1968 Hewlett-Packard first brought LED lamps to the mass market.

However, early LED lamps were inefficient due to their red color displaying, making them unsuitable for general lighting and restricting their uses to numeric displays and indicator lights. The first high brightness blue LED was demonstrated by Shuji Nakamura which was then given a phosphor coating to convert into bright white LEDs.

Technology Overview

An LED uses solid-state lighting technology and emits light from a solid matter, unlike other lamps which emit light from a vacuum or gas. In the case of a conventional LED Bulb, the matter is a semiconductor. But the problem is some of its light is trapped inside this structure.

Unlike other candescent lamps, LEDs must be kept cool, as excess heat causes early failure and output is reduced.

Application

Made popular by their efficiency, range of color, and life span, LED lights are used on numerous occasions, such as night, art, and outdoor lighting. These lights are also commonly used in electronics and automotive industries, and for signage, along with many other uses, such as- desk lamps, reading lights, night lights, security lights, spotlights, accent lights, etc.

Benefits of LEDs

There are many benefits of LEDs such as longer life, energy efficiency, ecologically friendly, durable quality, zero UV emissions, design flexibility, operational in extremely cold or hot temperature, higher application efficiency, and low voltage consumption.

Limitations

  • Many LEDs will not work with existing dimmer switches.
  • Color rendering of LED is not identical to the lighting of the Sun, for what our eyes are better suited.
  • LED Bulbs may flicker which can cause headaches and eye strains.
  • The long life of LEDs may be useful to users but it is destroying the existing industry as replacements are not used frequently.
  • Flying insects are 48% more attracted to LED street lamps than HPS lamps which cause ecological impact.

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