Real emphasis on the use of natural light should be used in the design of buildings and lighting schemes will ultimately lead to greater energy savings over the lifetime of a project.
Whether it is better use of windows, roof lights or light wells and better designed lighting controls, natural light has been a constant since the big bang and will most likely outlast us all.
Until approx. 300 000 years ago daylight was the only source of light for prehistoric man. At that time fire was discovered as a source of light and warmth. For many thousands of years fire was used as a » mobile« source of light in the form of torches, oil and gas lamps and candles. Daylight was still extremely relevant in man's everyday life since fuel was often very valuable and the illumination of rooms with fires had substantial limitations. Often there was risk of damage from fire, and smoke impaired the quality of the air. Everyday working life was very much shaped by daylight. It was only at the end of the 19th century with advances in the development of electricity that it became possible to manufacture industrial carbon filament lamps or, later, incandescent lamps with a tungsten coil.