Now that you have learned the fundamentals of lighting and how lights can be fine-tuned we can continue with practical applications of The oretical knowledge you have gained.
Of course lighting primarily servers to make objects in a scene visible. Light can also effect the emotions with which a scene is viewed. Dark regions can be made to give an ominous impression, for example.
On the other hand, light can also be used to augment the modeling process. A light can illuminate a surface at a very flat angle to accentuate intricacies of that surface. The reflection of a light source on a surface (specular highlight) gives an indication of the type or quality of surface. A light’s color can convey warmth or coldness, artificial or natural light. And don’t forget about the previously described shadow effects that make it easier to perceive spatial depth and relations - even though we are actually viewing a two-dimensional image on our screens.