The first industrial uses of the LED (Light Emitting Diode) technology started through signage
applications (illuminated signs) from the 1970s.
This technology has really spread in general lighting applications since the 2000s.
In a very simple way, the LED is a semiconductor on which one
applies an electrical voltage generating the emission of photons from
The result obtained gives a perception to the human eye of
a white lighting for white LEDs.