The photometry is responsible for the study of optical stimulation that fails to make the electromagnetic radiation, that is, measures the ability of light to influence brightness that stimulates the human eye, allowing us to identify the wavelengths of light that can be perceived by the sense of sight, this allows us to create a table of the different wavelengths to which the eye is sensitive 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 since they are within the values of the visible spectrum (which is the same to say visible light).
Light sources are defined as bodies with the ability to strike a ray of light or emit radiation, it can be classified according to their origin, giving structures such as stars, fireflies, fire among other capable bodies in the name of natural light sources. to illuminate in a natural way 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 this purpose, the radiation intensity of these bodies can be measurable and are described as "luminous flux" , while if the amount of light emitted is measured, it is called < strong> "luminous intensity" .
