BQS 213-Lighting.pptx - BQS 213 GROUP 1 PRESENTATION ARTIFICIAL LIGHTING 1 INTRODUCTION Lighting is the deliberate use of light to achieve a practical

BQS 213-Lighting.pptx - BQS 213 GROUP 1 PRESENTATION...

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INTRODUCTION Lighting is the deliberate use of light to achieve a practical or aesthetic effect. It includes the use of both natural sources of light, mostly tapping daylight and artificial light sources such as lamp and light fixtures. In this dissertation, we shall dwell on artificial lighting, its sources and applications in architecture and also how the design of light fixtures can be used to increase energy efficiency. 2
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Depiction of early man using fire 3
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Background Man has always been dependent on light energy from the sun since the beginning of time. However, as the day ended and night came, the early man was forced to reside in total darkness. This later came to change with the discovery of fire by Homo erectus about 1 million years ago. The discovery of fire revolutionized the life of man as it had diverse uses right from cooking, heating to its use for lighting. 4
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Historical sources of Artificial Lighting Open fire flames and torches : these were used mostly during the middle and late stone age Lamps : these were a bit sophisticated and made use of animal and fish oils as well as vegetable oils Fire flies These sources were crude and inefficient but served their purpose at the time 5
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Historical sources of Light 6
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Evolution of lighting devices 7
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Incandescent Light Bulb An electric current is passed through the tungsten filament at the centre of the bulb and lights it to incandescence. This radiation is emitted in the form of light. The length and diameter of the wire determines the amount of energy output in form of light produced.
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