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Light emitting diodes (LEDs) are a digital light source. LEDs started life as light indicators in electrical components manufactured by Hewlett Packard. The light is a result of electrons releasing energy in the form of photons better known as electroluminescence.

Their energy efficiency, low maintenance, robustness and long life mean that they are now a bright weitere to the energy-hungry and delicate analogue light sources we all grew up with.

Originally their cost limited their use as an everyday light source. However ever-increasing energy prices combined with improved manufacturing process has made them a viable Auswahlmöglichkeit to Mr Edison's invention.

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