Light dispels darkness, forms shadows, is fascinating and above all vital for humans. There are many words with which light can be described, it has many characteristics and tasks. Light planning is often approached too theoretically. Much more important, however, is how luminaires work in reality on the room, in other words, in practice. Without a sampling of the luminaires planned on site, hardly any project will be well planned in the daily planning business. Light has a very different effect on its surroundings, whether indoors or outdoors. Therefore, luminaires must be selected in close relation to the planning object, if only to convince the client of the quality of the light. Theoretical programs show whether the luminous intensity is sufficient and complies with the regulations, but this does not mean that they fit well into the room and highlight it.