How have humans primarily used
artificial light

Human have primarily used artificial light to illuminate their surrounding especially during the dark hours of the day.

Explanation:

Light reaches us as an energy in the form of a wave in the visible-ray region of the electromagnetic spectrum. Light wave is picked up by the eyes; directly from the source of the light, or indirectly from reflecting off of a body in its path. Light is very important because it allows us to take in information about our environment through our eyes. In the absence of light, especially at night when other natural means of light has faded, artificial light from man made sources like the electric bulb, LED light, fluorescence light bulbs, etc becomes very important, for illuminating our surrounding.

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