The visual task expresses the perceptual performance required from the eye to perceive an object. The grade of difficulty of the task increases with the diminishing of colour contrast, size and detail.

In lighting design the visual experience is way more than “just” adding fixtures to a space. One of our crucial tasks consists of shaping the way any given space or object is perceived.

Visible light is the electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye. It is usually defined as having wavelengths in the range of 400–700 nanometers (nm), between the infrared or IR (with longer wavelengths) and the ultraviolet or UV (with shorter wavelengths).