Light-Emitting Diode

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Marria
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Light-Emitting Diode

Message non lu par Marria » jeu. août 23, 2018 3:52 am

A light-emitting diode (LED) is a semiconductor electronic component that converts electrical energy into light energy. This kind of electronic component appeared as early as 1962. In the early days, it only emitted low-light red light. Later, it developed other versions of monochromatic light. The light that can be emitted today has spread all over visible light, infrared light and ultraviolet light, and the luminosity has increased to equivalent. The luminosity. The use is also used as an indicator light, display panel, etc.; with the continuous advancement of technology, light-emitting diodes have been widely used in displays, television lighting decoration and lighting.

With the continued development of the industry, the technological leap of breakthrough, the application of the promotion, LED light efficiency is also constantly improving, prices continue to fall. The emergence of new modular dies has also led to an increase in the power of individual LED tubes (modules). Through the continuous efforts of the industry, the breakthrough of new optical design, the development of new lights, and the single product situation are expected to be further reversed. Improvements in control software also make LED lighting more convenient to use. These gradual changes reflect the broad prospects of LED light-emitting diodes in lighting applications.

LED is called the fourth generation of light source, which has the characteristics of energy saving, environmental protection, safety, long life, low power consumption, low heat, high brightness, waterproof, miniature, shockproof, easy dimming, concentrated beam, easy maintenance, etc. Various indications, displays, decorations, backlights, general lighting and other fields.

LED advantages: high electro-optical conversion efficiency (close to 60%, green, long life (up to 100,000 hours), low operating voltage (about 3V), repeated switching and non-destructive life, small size, low heat, high brightness, sturdy and durable, Easy to dim, colorful, stable beam, no delay;

LED shortcomings: high starting cost, poor color rendering, low efficiency of high power LED, constant current drive (requires dedicated drive circuit). In contrast, various traditional lighting has certain drawbacks.

Incandescent lamp: low conversion efficiency of electro-optical light (about 10%), short life (about 1000 hours), high heating temperature, single color and low color temperature;
Fluorescent lamp: electro-optical conversion efficiency is not high (about 30%), harm to the environment (including harmful elements such as mercury, about 3.5-5mg / only), non-adjustable brightness (low voltage can not be illuminated), ultraviolet radiation, flicker phenomenon, start-up Slow, rare earth raw material price increase (phosphor powder accounted for 10% to 60% to 70% of cost), repeated switching affects life; large volume.
High-pressure gas discharge lamp: large power consumption, unsafe use, short life, heat dissipation, and mostly used for outdoor lighting.

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Idra cesar
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Re: Light-Emitting Diode

Message non lu par Idra cesar » jeu. août 23, 2018 5:46 pm

Thank you Marria for this detailed overview leading to a deep knowledge of this useful kind of diodes.
But end up the overall text by focusing on the advantages instead ;)

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Marria
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Re: Light-Emitting Diode

Message non lu par Marria » mer. sept. 12, 2018 10:30 am


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