IMPACT OF NATURAL LIGHTING IN SCHOOLS
Abstract:
Light is electromagnetic radiation or complex of radiations emitted by luminous (flame or flameless) or luminescent bodies as waves wich impresses the eye when the wavelength is within the visible spectrum. (27) The usual light sources found in classrooms are: natural lighting provided by sunlight; lighting provided by incandescent and fluorescent light. Natural lighting shows optimal characteristics for a good performance of the visual apparatus: high light intensity, varied and continuous spectral composition, and adequate light distribution. Sun emits all radiations from X-rays to Hertz waves. Wavelength radiations close to the upper and lower limits of the visible spectrum may trigger the luminous sensation (the retinal excitation depends on whether light rays are able to cross the inner environments). (20) Measurements performed in natural light have highlighted the impact of classroom lighting both on emmetrope pupils and on ametrope ones. Natural lighting is influenced by the orientation of the windows in relation to the sun, the size of the windows and the distance of the banks in relation to the windows.
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