Photometry is in charge of the study of the optical stimulation that electromagnetic radiation manages to carry out, that is, it measures the capacity of light to affect a brightness that stimulates the human eye, allowing us to identify the wavelengths of light that can be perceived by the human eye. sense of sight, this allows us to create a table of the different wavelengths that the eye is sensitive to called “visible spectrum” which ranges between 400 and 750 mm.

This makes it clear that each value within the visible spectrum is perceived by the human eye in different colors despite the fact that they all make up visible light or simply light. A clear example of what the visible spectrum is is the rainbow, which is Product of the incident refraction of sunlight, which allows us to observe different colors, we can appreciate them since they are within the values ​​of the visible spectrum (which is the same as saying visible light).

Light sources are defined as bodies with the ability to strike a ray of light or emit radiation, they can be classified according to their origin, giving them in the name of natural light sources to structures such as stars, fireflies, fire, among other capable bodies. to illuminate naturally without modifications, on the other hand there would be artificial light sources such as spotlights or fluorescent bulbs which have the ability to radiate light because they were created by human hands for that purpose, the intensity of radiation of these bodies can be measurable and are described as “luminous flux”while if the amount of light emitted is measured, it is designated by the name ofstrong>“luminous intensity”.