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We live so immersed in the light that we don't realize its importance. There natural light it is essential to life and its lack causes biological imbalances. Like other electromagnetic radiations, the infrared radiation and those ultraviolet have relevant effects on living organisms, affect growth and development and intensify i metabolic processes. Light is important even when it is not there: darkness and its balanced alternation with the hours of light play an important action on living organisms.
Jonh Nash Oct., photography expert and inventor of the step one procedure which allows us to resume imperceptible processes such as the blossoming of flowers (imperceptible because they take place in too long periods of time for our perceptions) has shown that the different types of lighting, in addition to affecting biological processes such as reproduction, influence the size, the frequency and speed of tumors (for example in laboratory animals) for which light should be considered a variable to be considered at a scientific level.
From the studies of Dr. Ott it emerges that to live in good health it is necessary to regularly expose yourself to the entire spectrum of natural light, without shielding i ultraviolet rays. For this reason, he recommends always asking for glasses that let the broadest fraction of the entire spectrum pass through and to use contact lenses, eyeglasses and sunglasses without UVA filters.
Speaking of living environments, lighting should make the most of natural light and not cause waste of energy. This is for biological (well-being) and ecological (lower consumption) reasons. The lighting of the environments should be mainly natural and only integrated by the artificial one, taking into account factors such as: importance of the biological factor, correct use of sources and their arrangement, absence of variations in the intensity of light that tire the eyes, absence of phenomena of glare, correct relationship between lights and colors.
Environments and natural light. The rooms facing north, north-west, north-east should not be used for important residential functions or for a long day stay. All inhabited rooms should have a minimum amount of insolation of not less than one hour a day. Soft colors positively affect the quality of interior lighting, while saturated colors strain the eyes more. From a biological point of view, the recommended glasses are those that let through most of the radiation of the entire solar spectrum (such as those from solariums). For bioclimatic reasons, however, very selective glasses are preferred.
Environments and artificial light. It is of great importance both for visual and physiological comfort and for energy saving: the uses for lighting consume 10 to 20% of electricity (almost half in empty rooms). It should be taken into account that colors undergo variations due to artificial lighting: incandescent lamps emit infrared and red rays that overlap with other colors, staggering them. Fluorescent lamps can produce visual fatigue. The so-called True-lite fluorescent lamps emit a light that reproduces the entire solar spectrum: their use is recommended, particularly in workplaces where systems for fluorescent light are installed or where sunlight cannot penetrate. Fluorescent lamps are usually presented as the most efficient and economical, but this is true only in particular conditions of use.
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