What is LED?
The word "LED" stands for Light Emitting Diode.
It is a solid-state source of electromagnetic radiation visible, infrared or ultraviolet light. The LED diode consists of a semiconductor connector resulting from the merger of two types of semiconductor. The emission of photons, or ini other words the emission of light, occurs in the flow of electrical current through the LED in the forward direction. Current flowing through the light emitting diode (LED) begins to increase rapidly after crossing the threshold voltage, hence there is a need to use a resistor R which limits the increase.
- Energy Efficiency - (compared to traditional light sources a positive impact on the environment),
- High lighting efficacy,
- Long life (50 000 to 100 000 hours),
- Low or none IR and UV,
- Small size,
- They are safe for the environment, do not contain mercury (Hg),
- White light with adjustable colour temperature,
- Ease of operation and control,
- Resistant to vibration and shock, temperature and humidity fluctuations,
- Wide temperature range operation,
- Wide range of applications,
- A wide range of colours,
- Silent operation.tion.
LEDs lifetime, as well as other light sources, is measured in hours of lamp working time (under certain conditions), which preserves the relevant properties. In the case of LEDs, as well as for fluorescent and other discharge lamps that do not expire as light bulbs in a violent manner, the primary criterion for determining the stability of the lifetime in which is stored the corresponding value of the luminous flux. "The correct value" is usually referred to as a certain % of the baseline. For fluorescent lamps and other discharge lamps, the luminous flux at a level of from 70% to 90%. Similarly, the lifetime of LEDs is defined. Most often, the lifetime of LEDs is defined as the time during which the luminous flux is below 70% of the baseline.
A little bit of history...
- 1907 – H.J. Round as the first observed the visible light emitted from silicon carbide (SiC),
- 30's – introducing the phenomenon of electro-luminescence in zinc sulfide mixed with copper,
- 30's – 50's – the use of naturally occurring compounds to the phenomenon of electro-luminescence,
- 1962 – presentation of the first LED (GaAs) emitting in the near infrared (870 - 980nm),
- 1962 – the first visible light-emitting diode,
- 1968 – the first mass production,
- 1968 – the first green light diode,
- 80's – the creation of the first high-brightness LEDs,
- 1989 – The first blue and UV diode,
- 90's – start of mass production of high-power LEDs using AlGaInP. Obtaining a white light with colour combination of red, green, blue,
- XXI – extensive use of LED lighting in many industries including; television, electronics, IT, lighting.
The future of LED technology:
LEDs will surely find application in many modern industries (advertising, TV, commercial and professional lighting, including streets and industrial areas).
Mass production of LEDs using modern, automated production lines, offset spending on research and development of new production lines, and allows reducing the costs and prices of new diodes. This process makes LED light sources a widely available alternative, which displaces traditional light bulbs. In addition, the EU Ecodesign Directive is introducing significantly restricts access to ordinary light bulbs, which in turn enhance the development of modern light sources. The lofty goal and even global scale wants to reduce power consumption. Consequently, the newest technology of light sources will simply expand.
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