Use of LEDs for illumination

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Use of LEDs for illumination

 

Author: Wong, Tak-san
Title: Use of LEDs for illumination
Degree: M.Eng.
Year: 2009
Subject: Hong Kong Polytechnic University -- Dissertations.
Light emitting diodes.
Lighting.
Department: Dept. of Building Services Engineering
Pages: xvi, 121 leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2303479
URI: http://theses.lib.polyu.edu.hk/handle/200/3960
Abstract: The use of Light Emitting Diodes (LEDs) for illumination is not a common phenomenon nowadays. Despite the low power requirement of LEDs, traditional bulbs and fluorescent lamps are still widely used. Array of LEDs for illumination poses a problem in the lighting industry. The array of LEDs affects the uniformity of LEDs significantly in LEDs for illumination. The unsatisfactory effect of LEDs is due to the fact that uniformity is one of the major considerations in lighting design. This dissertation presents the findings of an investigation into whether the use of LEDs for illumination is acceptable. The standard uniformity of lighting design is suggested to be 0.7 for general illumination purpose. Totally twenty-seven measurements were carried out to investigate the uniformity of LEDs for different arrays. The data were then analysed mainly by comparison between uniformity of different arrays and separations in order to find out the best LEDs array for the use of illumination. In this dissertation, square array of LEDs was found to give the highest uniformity among three arrays which are circular, square and rectangle, LED is a well-known product which is energy saving with its low operation power. By solving the problem of uniformity, LED has a high potential in the lighting industry due to its low power operation (energy saving). It may lead a revolution for the lighting equipment in the coming future.

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