The picture to the left shows the configuration of a standard light diode. The chip is embedded in a reflecting tub. The right picture shows the reflector after the removal of the transparent plastic coating. The rectangular wire supporting the reflector, establishes the contact to the cathode and absorbs the lost heat. In the centre of the chip you can see part of the bond wire, which establishes the contact to the anode.

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Incandescent lamps emit heat, whereas light diodes do not. They emit light in a limited spectral segment, the light is almost monochromatic. They are therefore – compared to other light sources, where color filters have to filter the major part of the spectrum – very effective for signal installations.

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The advantages of LEDs


A light diode (LED) is an electronic semi-conductor element, that converts electric current directly into light – when electric current is streaming through the diode in the direction of transmission, it emits light. LEDs consume little energy, do almost not generate heat, do not contain infrared heat or UV rays.

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Through specific selection of the semiconductor materials and the endowment, the characteristics of the produced light can be varied. Especially the spectral segment (in the visible segment this corresponds to the color) and the efficiency can be controlled this way:



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