Mentioned about lighting, people would immediately think of various kinds of colorful lights in lamp shops. Although these lamps vary in form, their lighting core - the bulb actually can be divided into three types: incandescent bulb, fluorescent bulb and gas discharge bulb. However, this pattern will be changed in the near future, as a new star of lighting – light emitting diode bulb is moving towards practical stage.
Light emitting diode was invented in the 1960s of the 20th century. In the later decades of years, its fundamental purpose was an indicator light for radio-cassette recorders and other electronic devices. In order to give full play to light emitting diode lighting potential, scientists developed a new type of LED bulb for lighting, LED air vitamin purification bulb. This light bulb has the characteristics of high efficiency, long life, and ability to be used continuously for 100,000 hours, which is 100 times longer than that of ordinary incandescent bulbs.
It is estimated that globally, LED bulb has a market prospect of 9 billion pounds. In the huge business opportunities, some LED light bulbs wholesale suppliers like Philips are attracted. They have begun to invest millions of pounds for research and development of family light emitting diode bulbs. Scientists predict that over the next 5 years, this light bulb is likely to become the mainstream lighting product of the next generation.
As we all know, since more than 100 years ago the United States inventor Thomas Edison invented incandescent lamp, people still use incandescent light bulb produced with the technology invented by Edison. The intermediate of the bulb is a metal tungsten filament. When the current passes, the tungsten wire will be heated to an incandescent state and give out light.
However, the light emitting diode bulb has essential difference with both traditional incandescent lights no matter in structure or in the luminous principle. Diode is a commonly used component in electronic circuit, which consists of a semiconductor PN junction, together with electrodes wire and tube. Diode has PN junction two electrodes so that it is called diode. Diode has unilateral conductivity and many types, such as detection tube, rectifier tube, voltage-regulator tube, switching tube, luminescent tube, and photoelectric tube.
Light emitting diodes are often made from semiconductor materials such as gallium arsenide, and gallium phoshpide. They give out light when forward current passes and the luminous colors depend on the material used, such as red, yellow, green and infrared light. Light emitting diode is usually packaged with transparent plastic. The one with long pins is positive electrode, and the one with short pins is negative electrode. Some LED has three pins. According to pin voltage, LED could produce two colors of light.
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