12. Psychic and Light Microclimate
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Colors of the Internal Environment
•The color of the indoor environment can be expressed by:
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•Surface color and light color
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•Surface material
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•Combination of colors on multicolored surfaces
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•Size of spaces
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Indoor Lighting
•Lighting can be divided in term of light sources:
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•Daylight - natural, scattered light and direct sunlight
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•Artificial lighting - artificial sources
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•Combined lighting - Daylight illumination supplemented with artificial light
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Indoor Lighting
•The criteria used to describe the light microclimate are:
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•Daylight factor
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•Illumination
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•Temperature of chromaticity
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•Color rendering index (CRI)
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•Glare index
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Indoor Lighting
•The light is a visible glow capable of inducing an immediate visual perception evaluated by normal
human sight. The range of visible radiation is within the wavelength range from 380 to 780 nm.
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•The daylighting factor is the ratio of illumination at a point on a defined plane by a direct or
reflected skylight at that time to a comparative illumination of the outer, unshaded horizontal
plane under the assumed or known distribution of sky brightness.
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•Light intensity (illumination) is a photometric quantity defined as the light flux incident to the
surface unit. It is therefore the ratio of light flux (lumens) and area (m2).
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Color of the Space
•Visual perception of colors creates feelings of warmth and cold.
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•Color is the property of light, or the substance from which the light comes out. Color expresses a
perception that is created on the retina by visible electromagnetic radiation (waves).
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•The color perception depends on the spectral composition of the incoming light (dependence of
light flux and frequency or wavelength) and its intensity relative to the background.
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Effects of Psychic and Light Stress
•Visual perception of the internal space is closely related to the central nervous system.
•Light microclimate encourages feelings of anger, excitement, or joy and serenity.
•The light microclimate is defined by the geometric dimensions of the space, the type of light
sources, the number and layout of the luminaires, the uniformity of lighting, the color rendering
and the contrast in space.
•Mental fatigue can be a consequence of all components of the environment on the human nervous
system.
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