Increasingly the LED bulb arises as a rival of these compact fluorescent and halogen lamps. But what does the acronym LED or LED hide? And who really is this little last of the luminaire market?
LED Or LED? A Bit Of Terminology And History
According to Growtheology, LED stands for “Light Emitting Diode” ie “Electro Luminescent Diode”in good French, which is abbreviated as LED. And no one being a prophet in his country, it is rather the LED Anglicism prevails on the French DEL!
The LED is the latest in the family of light bulbs. Yet the discovery of the electroluminescence phenomenon by the English Henry Joseph Round, dated 1907. Twenty years later, Oleg Vladimirovich Losev filed the first patent for what would become an LED. In 1936, the French physicist Georges Destriau continued work on electroluminescence.But it was not until 1962 that Nick Holonyak Jr. and S. Bevacqua, researchers at General Electric, created the first light-emitting diode with visible spectrum. Red, their colleagues will call it “the magic device” because the light emitted was visible to the naked eye. These LEDs are known to you, the red, yellow or green LEDs indicating that your electrical appliances or electrical appliances are energized.
During the 1990s, the Japanese company Nichia develops the first blue LEDs and then the white LEDs. The LED then leaves the restricted area of the indicator light to compete directly with the halogen bulb and compact fluorescent.
How Does A Led Bulb Work?
To simply summarize a technology which is not, it is necessary to know that a diode is an electronic compound comprising two semiconductor elements that allow the passage of the current in a determined direction. A semiconductor being a crystalline body which is both conductive, that is to say it allows the current to pass and is insulating. Electroluminescence, on the other hand, is the ability of certain bodies to become luminous when they are traversed by an electric current.
Wisely mix the set and you get an LED where the two layers of semiconductors have opposite electrical characters. This potential difference at the junction of the two layers releases energy in the form of photons.
According to the nature of the semiconductors used, the photons thus created will emit in visible wavelengths for our eye: red, yellow, green, blue.
The Use Of LED Bulbs In Our Daily Life
Since they have gone from the experimental stage to that of consumer products, LEDs have found very different fields of application. Not only have you seen them since the 60s with the lights of all your home appliances, clock radios, hifi devices but also in the headlights of your car, in your flashlight, the backlight of your computer screen or Of your TV, your Christmas garlands, and of course your electric light bulbs.
This Is Because LED Technology Has Many Advantages:
Low power consumption.
Alifetime important from 20 000 to 50 000 hours.
A good light output of 20 to 100 Lumens / Watt or more.
Analmost zero light inertia , that is to say that an LED bulb turns on and off in a very short time and immediately reaches its maximum efficiency. It is interesting for places where light is often switched on and off.
Small size and sturdiness.
Ofdifferent colors according to the wavelengths emitted by the semiconductor or by combining a blue LED and a phosphor.
Itdoes not emit ultra-violet. An undeniable asset when it comes to illuminating objects that can be damaged by light such as paintings.
Medium power LEDs emit little heat and therefore present less fire hazard than a halogen bulb.
On the other hand, the blue light emitted by certain LED bulbs presents a danger for the retina and the children .
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