Understanding Lighting in Building Services: Natural and Artificial Lighting, Slides of Computer science

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SUBJECT :BUILDING

SERVICES

TOPIC: LIGHTING

LIGHTING – INTRODUCTION

The provision of ample light in a building is of primary significance as it serves two purpose, namely, for illumination and for granting hygienic conditions. Lighting should be planned in a manner as to create mood or atmosphere and should compel

The primary source of lighting for day lighting is the sun. The light received by the earth from the sun consist of two parts, namely , direct solar illuminance and sky illuminance. For the purpose of day lighting design ,direct solar illuminance shall not be considered and only sky illuminance shall be taken as contributing to illuminance of the building interiors during the day. TYPES OF LIGHTING

NATURAL LIGHTING

DIRECT SOLAR V.S.

SKY ILLUMINANCE

DAY LIGHT COMPONENTS

 SKY COMPONENT  EXTERNAL REFLECTED COMPONENTS  INTERNAL REFLECTED COMPONENT

FACTORS AFFECTING

SKY ILLUMINANCE

 Altitude of the sun

FACTORS AFFECTING

SKY ILLUMINANCE

 The day of the year

FACTORS AFFECTING

SKY ILLUMINANCE

 Time of the day

Where the recommended luminance levels

have to be obtained artificial lighting only.

To supplement day lighting when the level of

illumination falls below the recommended

value.

Where visual task may demand a higher level

of illumination.

ARTIFICIAL LIGHTING

ARTIFICIAL LIGHTING

LUMEN METHOD STEPS

Determination of the illumination level

Selection of the light source and luminaries

Utilization factor and coefficient of utilization

Arrangement of the luminaires

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