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Illumination (CIH) Questions and Answers 100% Solved
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Exam of 3 pages for the course CIH at CIH (Illumination (CIH))
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Illumination (CIH)Poor illumination - answer causes fatigue, accidents, and decrease efficiency, morale
and production
lumen - answer The unit of light output or luminous flux emitted from a light source. It is
used to represent the total light output of light sources. One lumen is the flux on one
square foot of a sphere, one foot in radius with a light source of one candle at the
center, and radiating uniformly in all directions.
By definition, a light source that is one candela produces 4pi: lumens (4*3.1416=12.57
lumen).
luminous intensity - answer indication of how much light a source gives off in any given
direction. Units in candela
illumination - answer The amount or density of light flux incident upon a surface. (amnt
of light hitting a surface) in footcandles. fc=1lumen/ft2
luminance - answer Photometric brightness is a measure of light emitted by a
luminous body or reflected from a certain area of a surface. The term brightness alone
refers to the sensation that results from viewing surfaces from which light comes to, or
is reflected to, the eye; however, the terms are often used interchangeably as the
context usually indicates whether the sensory or photometric meaning is intended. Units
foot lamberts or candelas/m2.
reflectance - answer Provides a measure of how much light is reflected from a surface.
It is the ratio of the luminance of a surface to the illumination on the surface (i.e.,
reflectance =luminance/illumination). Ex black surface has 0% reflectance, white 100%
Visibility - answerVisual task performance factors are dependent on:
1. Size of an object or task - expressed in terms of visual angle.
2. Contrast between the details of an object and its immediate background.
3. Time of viewing.
4. Luminance or brightness - without luminance all objects would be invisible.
refraction - answerbending of light as it passes through a medium to another.
diffusion - answerlight traveling through a translucent material
transient adaptation - answereye must have time to adapt from light to dark and dark to
light situations. Takes longer to adjust from light to dark.
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