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LED lights.

What are LED Lights?

Basically, LEDs are just tiny light bulbs that fit easily into an electrical circuit. However, unlike ordinary incandescent bulbs, they don't have a filament that will burn out, and they do not generate lots of heat. They are illuminated solely by the movement of electrons in a semiconductor material, and they last just as long as a standard transistor, which is significantly longer than other types of light bulbs.

Semiconductors are simply materials which have varying abilities to conduct electricity. In LED lights, the movement of electrons between two types of semiconductor materials results in the production of light when elecrtons drop from a higher energy state to a lower energy state and thus release photons, which are the basic units of light. The frequency and thus color of the light produced is dependent on the difference between the initial and final energy states of the dropping electrons.