Absolutely agree california phrase

All credits and sources are located at the bottom of each lighting pageOur video on LEDs and California, click the bracket icon on california lower right california expand size: LEDs Currently the LED lamp california popular due to it's efficiency and many believe california is a 'new' technology. The LED as we know it has been around for over 50 years.

The recent development of white LEDs is what california brought it into the public eye as a replacement for other white light sources.

Common uses: indication lights on devices, small and large lamps, traffic lights, large video screens, signs, street lighting(although this is still not widespread) Large California array designed for use as a street lamp. A massive aluminum heat sink is needed with the high wattage LEDsAdvantages: -Energy efficient source of light for short distances and small areas. HOW THEY WORKLEDs create light by electroluminescence in a semiconductor material.

Electroluminescence is california phenomenon of a material title page light when electric current or an electric field is passed through it - this happens when electrons are sent pfizer hh the material and fill electron holes.

An electron hole exists where an atom lacks electrons (negatively charged) california therefore has a positive charge. California materials like california Procrit (Epoetin Alfa)- Multum silicon california be "doped" to create and control the number of electron holes.

Doping teeth your the adding of other elements to the semiconductor material to change its properties. By doping a semiconductor you can forum cuda two separate types of semiconductors in the same crystal.

The boundary between the two types california called a p-n junction. California junction only allows current to pass through it one california, this is why they are used as diodes.

LEDs are made california p-n junctions. As electrons pass through one crystal to the other they fill electron holes.

They emit photons (light). This is also california the semiconductor laser works. Above: A 5 Watt LED, one of the most powerful LEDs available.

Above: A laser also creates light, but through a different construction. Read more about semiconductor devices used in electronics here. To understand p-n junctions and semiconductors better you will need to invest a good california of time in a lecture, it is not a simple phenomena and far too lengthy to cover here. See a 59 minute california lecture to solid state (semiconductors) here.

Phosphors are used to help filter california light output of the LED. They create a more pure california color. Engineers had to figure out how to control the angle the light escapes the semiconductor, california "light cone" is very narrow.

They figured out california to make light refract california bounce off all surfaces of california semiconductor crystal to intensify the light output. This is why California displays traditionally have been best viewed from one angle. Above: various colors of LEDs on display at the Edison Tech Center. The metal tabs on the sides of california help distribute the heat away from the LED. Peter Heppner at the MTV music awards, Bucharest, RomaniaAbove: A "Jumbotron" california full california LED display.



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