10 Questions
What does DLOR stand for in the context of interior illumination?
Direct-Light Output Ratio
What is the purpose of maintenance factor in lighting design?
To consider the aging of lamps and reduction in light output
What is the coefficient of utilization in lighting design?
The efficiency of the lighting fixture in delivering light to the work plane
What does ULOR stand for in the context of interior illumination?
Upward-Light Output Ratio
What is the space to mounting height ratio used for in lighting design?
To guide the layout of lamp luminaires
What are the factors affecting coefficients of utilisation in interior illumination?
Factors affecting coefficients of utilisation include reflectance of surfaces, room shape and size, and the position and type of luminaires.
How is the lamp lumen output determined, taking into account voltage and temperature variations?
The lamp lumen output is determined by considering the variations in voltage and temperature using correction factors specified by the lamp manufacturer.
What are the Indian standard recommendations and standard practices for illumination levels in various areas?
The Indian standard recommendations and practices for illumination levels in various areas are provided by the Bureau of Indian Standards (BIS) and cover specific requirements for different spaces such as entrance areas, staircases, corridors, and industrial buildings.
What is the significance of the space to mounting height ratio in lighting design?
The space to mounting height ratio is significant in determining the appropriate layout of luminaires and ensuring uniform illumination across the designated area.
How is the selection of utilisation factor, reflection factor, and maintenance factor important in the design of interior lighting?
The selection of utilisation factor, reflection factor, and maintenance factor is crucial in achieving the desired illumination levels, energy efficiency, and maintenance considerations in the design of interior lighting.
Study Notes
Lighting Design and Illumination
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DLOR stands for Downward Light Output Ratio, which is the ratio of lumens emitted downward by a lighting fixture to the total lumens produced by the luminaire.
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The purpose of the maintenance factor in lighting design is to account for the reduction in illumination over time due to lamp depreciation and dirt accumulation.
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The coefficient of utilization (CU) is the ratio of the lumens received on the task surface to the total lumens emitted by the luminaire; it takes into account the efficiency of the luminaire and the room's reflectances.
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ULOR stands for Upward Light Output Ratio, which is the ratio of lumens emitted upward by a lighting fixture to the total lumens produced by the luminaire.
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The space to mounting height ratio is used to determine the number of luminaires required for a given space, and is calculated by dividing the mounting height of the luminaire by the spacing between luminaires.
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The coefficients of utilisation are affected by factors such as room surface reflectances, luminaire efficiency, and luminaire distribution.
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Lamp lumen output is determined by considering the effects of voltage and temperature variations on the lamp's performance; this is typically done using manufacturer-published data or by testing the lamps.
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The Indian standard recommends specific illumination levels for various areas, including residential, commercial, and industrial spaces.
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The space to mounting height ratio is significant in lighting design because it determines the number of luminaires required to achieve a desired illumination level, and affects the overall efficiency and uniformity of the lighting system.
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The selection of utilization factor, reflection factor, and maintenance factor is crucial in interior lighting design because it directly impacts the calculation of the required number of luminaires, and ultimately affects the energy efficiency and overall performance of the lighting system.
Test your knowledge of interior lighting design with this quiz on EET463: Illumination Technology Module 3. Explore definitions of maintenance factor, uniformity ratio, direct ratio, coefficients of utilisation, and factors affecting them. Understand the illumination required for different work planes, types of fixtures, and related terms such as DLOR and ULOR.
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