
Illumination occurs when a beam of light from a light source hits the object and reaches the eye. In other words, the light source does not need to come directly to the eyes; in fact, the light coming directly from the light source to the eyes will tire the eyes. This is not a desired situation. It is also a negative situation in terms of job security.
To summarize, appropriate illumination is achieved by directing a sufficiently powerful light source only to the place that is desired to be illuminated. To summarize;