The word LED comes from the words Light Emitting Diode.
This is a semiconductor diode, which, when receiving a polarized electric current, emits light of a narrow and discontinuous spectrum.
The brightness of LED is measured in Lumens and the efficacy of the lighting is the ratio of the light energy produced (Lumens) to the energy consumed (in Watt).
LED first became known to the public due to their use in electrical appliances (TVs, radios, stereos, computers, refrigerators, phones etc.) in the bright indicators of function on each device. Within the following years, exceptional technological advancements took place as to their operation. Thanks to their multiple advantages in protecting the environment, saving money & energy and offering the highest standards in quality of light, LED are now gradually replacing conventional light bulbs and are used as main lighting source for every lighting application.
Conventional incandescent lamps are now considered out of date technology, as they consume more energy, have a shorter life span, emit high heat compared to the light they bring and burden the environment.