"Illumination" essentially refers to lighting, but technically, it signifies the amount of light required in a specific location to perform a particular task.
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Illumination is a versatile concept, and its significance varies depending on the task at hand.
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If a point source of light, which emits equal light in all directions, is placed at the center of a hollow sphere, the light will fall on its surface uniformly.
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According to this law, the illumination of a surface is inversely proportional to the square of the distance between the source and the surface.
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According to this law, the illumination at any point on a surface is proportional to the cosine of the angle.
– Luminous Flux: This refers to the energy radiations emitted from a light source, such as an electric lamp
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– Illumination: The formula for calculating illumination is straightforward: Illumination (Im) = Luminous Flux (Im) / Area (A).
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Depreciation factor: When our lamps, tubes, etc. are now they give light. With time they are covered with dirt, dust, etc.
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Lumens: It is the unit of luminous flux and may be defined as the luminous flux, emitted per unit solid angle, from a light source of 1 candle power (C.P.)
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