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Economic comparison of light sources
Růžička, Josef ; Motyčka, Martin (referee) ; Štěpánek, Jaroslav (advisor)
This bachelor thesis deals with the economic comparison of light sources. On the market there is currently no physical quantity that would enable the light sources to be compared from an economic point of view in long-term perspective. The main objective of the work is, therefore, by calculations of the specified (or directly measured) parameters of the light source to provide a uniform total cost of lighting, thanks to which it will then be possible to sort the sources according to the price benefit. Evaluation is based on measurements of 28 light sources from different groups: the classical bulbs, halogen bulbs, compact fluorescent bulbs, compact LED retrofits and dimmable LED retrofits with color-changeable modes. These light sources are meant to be used for indoor home lighting, offices, halls, etc. The final part of the paper clarifies what kind of light sources and for what reasons they are the most profitable and have the greatest potential for the future. There's also a comparison of theoretical parameters provided by the manufacturer, and parameters directly measured in the laboratory and the evaluation of the deviations between them. The use of this thesis comes from provision of the calculation structure to a user who will better understand the topic of costs while purchasing the light source. Well arranged description and information about the light sources in theoretical part of the thesis is another utility to be mentioned.
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Spectrum Analysis Of Damaged Led Light Sources
Janík, Daniel
Permanent damage to LED chips, often high temperature is one of the common problems. The article compares the spectrum of LED retrofits before and after permanent high temperature damage. Several different samples tested were damaged by the same defined temperature during operation. The radiated spectrum was measured before and after exposure to the temperature and subsequently evaluated.
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Economic comparison of light sources
Růžička, Josef ; Motyčka, Martin (referee) ; Štěpánek, Jaroslav (advisor)
This bachelor thesis deals with the economic comparison of light sources. On the market there is currently no physical quantity that would enable the light sources to be compared from an economic point of view in long-term perspective. The main objective of the work is, therefore, by calculations of the specified (or directly measured) parameters of the light source to provide a uniform total cost of lighting, thanks to which it will then be possible to sort the sources according to the price benefit. Evaluation is based on measurements of 28 light sources from different groups: the classical bulbs, halogen bulbs, compact fluorescent bulbs, compact LED retrofits and dimmable LED retrofits with color-changeable modes. These light sources are meant to be used for indoor home lighting, offices, halls, etc. The final part of the paper clarifies what kind of light sources and for what reasons they are the most profitable and have the greatest potential for the future. There's also a comparison of theoretical parameters provided by the manufacturer, and parameters directly measured in the laboratory and the evaluation of the deviations between them. The use of this thesis comes from provision of the calculation structure to a user who will better understand the topic of costs while purchasing the light source. Well arranged description and information about the light sources in theoretical part of the thesis is another utility to be mentioned.
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