ARTIFICIAL ILLUMINATION IN ENVIRONMENTAL DESIGN
Light is the electromagnetic radiation which waves reach a brain of the person through the visual device, allowing it to see. Thus different wavelengths are perceived by us as certain color in a spectrum from red to the violet. Light is reflected from subjects or gets through them, allowing them to distinguish. The world is visible only because is shined. Natural light - solar, lunar and reflected - is dynamical and various, it varies within days. Unlike it artificial light is static and a function only according to a choice «is included/is switched off».