LED stands for Light Emitting Diode (light emitting diode) is nothing but a opto-electronic device that uses the optiche property to some semiconductor materials to convert the electrical energy passing through it into light, with minimal heat loss (about 10%) and with a light ultrarossi and ultraviolet-free.
The wavelength (and therefore the colour of the light) can be adjusted using semiconductor materials and manufacturing processes. In addition, the wavelength is propagated from the light emitted is relatively restricted, creating in fact the purest colours.
The LED is the revolution in lighting; We use the light as we had never used before, with remarkable savings and benefits: energy saving, long life, instant on, full spectrum of colors, absence of mercury, etc.
LED technology was established in the early 60s, with the American Nick Holonyak Jr and with only red bulbs used mostly as a signal light. In the 90s the LED technology undergoes a major acceleration, with the production of LED lamps of different colors, including white light. Meanwhile, the benefits are increased exponentially, far outpacing the efficiency of incandescent and energy saving ones.
Today technological research allowed achieving 161 lm/W for high power LED, although currently not yet available in the market. This level of performance shows that the LED technology has not yet reached its peak.
Comparison of lighting systems
According to Internetdict, LED lighting is much more efficient than incandescent lighting and new energy saving lamps.
The incandescent lamps generate light by conveying electricity through a filament until it gets so hot that they become incandescent. In this way, however, only a small fraction of energy is used to produce light, while more than 90% of this energy is wasted as heat.
The energy saving lamps (CFL) instead convey electricity into a tube containing gas. The reaction of these gases is the production of ultraviolet light that crosses the fluorescent coating inside the tube into visible light. This process is more efficient than incandescents, but again most of the energy is wasted as heat. The energy lost is about 80%.
LED lighting emits light through a process much more efficient than electric discharge, where electrons are grouped into electron-hole pairs in the device, releasing energy in the form of photons. The small amount of heat that is generated in this way, is transferred from the light source to “heat compartment” located at the bottom of the lamp.
Doing so generates light much more efficiently. At constant light, LED lights consume far less energy when compared to an incandescent lamp or an energy-saving lamp (CFL).
Example: a 6 W LED lamp has a light output comparable to that of a 45-watt incandescent lamp W or to that of an energy-saving lamp from 13 W for targeted illumination.
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