Light-emitting diodes (LED) are electrical semiconductors that produce light through the movement of elections. More specifically, the diodes have a positive and a negative charged layer. The positive layer has openings for the electrons; the negative layer contains free floating electrons. When an electric charge strikes the diode, it activates the flow of electrons from the negative to the positive layer. The excited electrons emit light as they flow into the positively charged openings.
LED Cool to the Touch
Because only a small amount of heat is released backwards during this process, LED’s are basically cool to the touch.
LED lighting is a form of solid-state lighting (SSL), illuminated solely by the movement of electrons in the diodes; therefore they last just as long as a standard transistor – the lifespan of a LED surpasses lifespan of an incandescent bulb by thousands of hours.