SCHEME OF LIGHTING AND ITS CONTROL.pptx - SCHEME OF LIGHTING AND ITS CONTROL Basic Principles of light There are four methods of light control \u2013

SCHEME OF LIGHTING AND ITS CONTROL.pptx - SCHEME OF...

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SCHEME OF LIGHTING AND ITS CONTROL
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Basic Principles of light There are four methods of light control: Reflection Refraction Diffusion Absorption
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Reflection When a ray of light falls on any surface, a part of the light is sent back to the same medium. This phenomenon where the incident light falling on a surface is sent back to the same medium is known as reflection. There are two types of reflection of light: Regular reflection Irregular reflection
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Regular reflection Regular reflection takes place when a ray of light is incident on a polished smooth surface like a mirror. Here the reflected ray of light moves only in a fixed direction. It is also called as Specular reflection. Incident light Reflected light
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Irregular reflection Irregular reflection takes place when a beam of light is incident on a wall or wood, which is not smooth or polished. Also called as diffused reflection or scattering of light.
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THE RATIO OF REFLECTED LIGHT ENERGY TO THE INCIDENT LIGHT ENERGY IS KNOWN AS REFLECTION FACTOR
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Law of Reflection The angle of incidence is equal to the angle of reflection. The ratio reflected light to incident light is known as reflection factor.
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REQUIREMENT OF GOOD LIGHTING Provides visual comfort Increase the efficiency of a workman Minimum glare --- brightness – contrast Reflected glare should be avoided
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Lighting Schemes
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  • Fall '14
  • H N SHANKAR

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