Illumination.pptx - ILLUMINATION \u2022 Illumination makes the surface to look brighter with a certain colour \u2022 The eye interprets this brightness and

# Illumination.pptx - ILLUMINATION • Illumination makes the...

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ILLUMINATION Illumination makes the surface to look brighter with a certain colour. The eye interprets this brightness and colour as something useful. Light maybe produced by passing electric current through filaments as in the incandescent lamps or through arcs between carbon rods or metal rods.
TERMS USED IN ILLUMINATION Light – It is defined as the radiant energy from a hot body which produces the visual sensation upon the human eye. It is denoted by Q and expressed in lumen – hours. Luminous flux – is defined as the total quantity of light energy emitted per second from a luminous body. It is represented by the symbol F and is measured in lumens (cd-sr). Luminous Intensity – in any given direction is the luminous flux emitted by the source per unit solid angle, measured in the direction in which the intensity is required. It is denoted by the symbol, I and is measured in candela (cd) or lumens per steradian. Lumen – the lumen is the unit of luminous flux and is defined as the amount of luminous flux given out in a given space represented by one unit of solid angle by a source having an intensity of one candle power in all directions. Lumen = Candle power x solid angle = CP x ω
TERMS USED IN ILLUMINATION Candle Power – is the light radiating capacity of a source in a given direction and is defined as the number of lumens given out by the source in a unit solid angle in a given direction. It is denoted by the symbol CP. CP = Lumens/ω Illumination – When the light falls upon any surface, the phenomenon is called illumination. It is defined as the number of lumens falling on the surface per unit area . It is denoted by the symbol E and is measured in lumens per square meter or lux. If a flux of F lumens falls on a surface of area A, then the illumination of that surface is E = F/A lumens /m 2 or lux.

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• Fall '14
• H N SHANKAR

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