Light diodes are low-voltageelectroluminescent devices that emit light as electrons pass through an elementary p-n junction. Radiation of light occurs when injecting through the p-n-junction of minority carriers. Diodes can be excited by a constant, variable and impulse voltage.
The diode lamp contains an anode and a cathode. The anode is designed to attract electrons that secrete the cathode, a positive voltage is always applied to the anode. When an electric current is applied to the lamp contacts, an electric field is formed between the anode and the cathode, it helps the electrons emitted from the cathode (such electrons are called free) to move toward the anode. Currently, LED lamps - this is the most promising direction of development of lighting equipment and light sources. Diode lamps replace incandescent and halogen lamps, begin to create competition even energy-saving.
The diode lamp has its advantages and disadvantages. Its main advantage is low power consumption. It is about ten times lower than that of an incandescent lamp, and approximately three times lower than that of a fluorescent lamp. A small consumption of electric current is due to the fact that the power of diode lamps is rather low.
Disadvantages of LED lamps are more thanmerits. The main disadvantage is the very high price. For example, household diode lamps with a power of 9-10 W will cost up to 2000 rubles, and office type (Armstrong ceiling) - from 5000 rubles. The second drawback: the 100,000 hours of continuous operation declared by the manufacturers in practice show a much shorter service life. This is because there is an effect of degradation of LED crystals. The manufacturer, however, gives a guarantee for its products 3-5 years. Given that the diode lamp pays off in 5 years, you can lose your money. The next drawback is narrow-beam light and an unpleasant spectrum of luminescence.
LED lamps have found their application inautomotive industry. Since the 1990s, automakers have started using LEDs in car headlights, stop lamps, direction indicators, dimensions, interior lighting and instrument panel, etc. The car's diode lamps have a different spectrum of glow: from red to blue. Now many manufacturers produce high-quality LEDs for cars of different models, this opens up huge opportunities for tuning the car.</ p>