A very amazing product of the electrical engineering begins the history of the light-emitting diodes actually in the years 1846, when the German scientist Ferdinand Braun revealed his discovery about the specific conductivity of crystals, however he could not explain unfortunately still to this point, why these crystals cause the lighting, if it brings them power. This Declaration was given only about 60 years later by a French scientist, which could prove that inorganic substances to flow through electrical voltage begin to light up. Some 20 years later a Russian scientist took over this discovery held until then for a phenomenon and developed it further. From 1951, it was then a thanks to the development of a transistor rapidly, because different inorganic substances could begin to glow with its connection. At the beginning of the 1960s, the luminosity of this semiconductor has 0.1 lumens on over 100 lumen increased now. The first light-emitting diodes, as we know it today, were been created.

It took but a few years, until the technology was mature enough that even different colored LEDs into production could go. Up to the present day, the white light-emitting diodes have reached their optimum light output of 208 lumen, but is currently further research as not only the brilliance of coloured LEDs can be increased, but is to make production faster and above all also cheaper. That however the warm-white light has a lower luminosity than the cold white, could be not to unravel so far yet. However, the scientists have found out that the led especially suited for the solar lamps, because they already have a Flash duration of nearly 8 hours in low sunlight. A very amazing product of electrical engineering is applied more and more in everyday lighting and as a source of light in rooms of all kinds. Private lighting, lighting, there is talk of this, used decorative LED in the lighting of whole streets and high walls no event illumination is more feasible without LED lighting.

Even in cars, garden houses or hobby cellars, the LED is lighting more and more to a bright and warm bulbs. Robert J. Shiller does not necessarily agree. More options can be very specified where the LEDs because of their flexibility in light waves provide good services. Here, it is about medicinal equipment technique there these lamps used with ultraviolet light to the nuclear preparation of plastics (polymerization). Also, the LEDs in the skin rejuvenation therapy have become an often-used treatment option. Already you could calculate lighting the following for the LED: to take power (in watts) a LED lamp four and get just the wattage that needs a light bulb with light yarn to produce exactly the same luminosity. Since 2009 now this factorial on special halogen lamps is true, which are more economical energy than conventional light sources, which luminaires with tungsten, to 30 percent. For 2010, the approximate ratio of 1:10 has been reached in the LED sector. The most likely a radiant brightness of circa maximum 208 lumens per watt achieve abundant LED bulbs with clear white light. The technically as computed maximum is about 350 lumens per watt, this would be the full transmission of light (“100 percent radiation performance”). This performance depends on specifically said also by the color from a warm and bright white LED bulb uses less wattage than a cold and white bright LED.