LED lighting

Using LED bulbs v bežnej in the households will reduce the cost f lighting your home by up to 90%.

What is LED?

LED, or also Light-emitting diode (light emitting diode, LED, light emitting diode) is an electronic component called. semiconductor emitting a narrow spectrum light when electricity is passed in the forward direction. Light effect is the result of the recombination of electron-hole pairs as a form of electroluminescence. Light colors depend on the elements used in semiconductor materials.

LED bulbs are adequate and full replacement in lighting technology . Compared to conventional bulbs, LEDs offer advantages such as longer life and very low power consumption. Life is more than 50 000 hours, while consumption is of the order in units of watts, depending on the number of LEDs.

The cheapest version of the infrared diode , followed by green and blue, which are the most expensive version. Use LED bulbs is as at home as well as displays and large-area imaging for advertising purposes. It is now also used as traffic lights. Because of its durability and otrasuvzdornosť also apply in cars, even as a replacement brake or end-Flasher. Infrared LED especially laser diodes are used to transmit information through optical fibers. Laser diodes have found mass application in the field of data storage (CD, DVD).

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History LED technology

LED technology in historical terms is already dated to 1907, when Henry Joseph Round discovered the existence of electroluminescence.

Electroluminescent it is a phenomenon by which generates electromagnetic radiation that makes LED on. The first practically useful LED diode developed in 1962 the Canadian scientist Nick Holonyak. This LED to emit red light.

In the very beginning were LEDs used as an indicator because of poor performance and poor range of colors provided. LED indication of a gain combining words Light Emititing Diode (light-emitting diode). In 1971 there was a shift in this area, which brought new colors of LEDs, which expanded use of LED technology. Despite progress, however, LED technology was expensive, use the special technical equipment and installations. Only in 1995 it has managed to make the first white LED, which paved the way for constructing usable LED bulbs for ordinary consumers.

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In the picture above – the first LED developed for General Electric scientists Holonyak taken for use on TV.

Advantages of LED technology

• LED light produces more light per watt compared to standard lamps, LED most powerful more than 100 lm / W, lamp from 48 to 65 lm / W, Tungsten 16-22 lm / W, Normal bulb about 15 lm / W
• LED bulbs have a comparable luminosity several times lower operating costs
• LEDs produce less heat than conventional light sources, typically up to 40 ° C in the performance 1-5W
• LED achieves an extremely long life – about 50,000 hours (over 17 years at 8 hours of daily operation), some manufacturers indicate up to 100,000 hours
• LED bulbs emit light of the desired color without the use of optical color filters
• LED lights in the dimmer function does not change its color when the supply current reduction compared to conventional light bulbs, with a reduced supply current issuing pronounced yellow light
• LED lighting is shockproof
• LED lighting is ideal in cases where it is necessary to frequently turn on and off light
• LED bulbs emit UV or IR radiation, becoming therefore also suitable for use in museums, galleries and other applications where UV and IR radiation from a light source not acceptable
• LED lighting does not require heating the fiber at lighting up time and reduces lighting the
• LED bulbs do not contain mercury or heavy metals that are harmful to health
• Ability to design their own production of luminaires – availability LED chips and control electronics

Disadvantages of LED

• Higher installation costs calculated per 1 lm
• LED technology requires a precise power flow
• LED emits light narrow beam, it is necessary to use lenses
• Longer adaptation to LED lighting – it has weaker

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Overall benefits LED technology

LED lighting has become a symbol of the 21st century. Finds use in many technical and artistic fields, as well and the lighting in households, primarily due to its advantages such as low energy consumption (min. 10 times lower), higher efficiency (90% of the electrical energy converted into light energy, incandescent lamps only the 3 and 5%), durability (50 to 000 hours).

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