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Design and construction of advanced LED lighting system for aquarium
Novák, Pavel ; Škoda, Jan (referee) ; Pavelka, Tomáš (advisor)
The first part of this thesis is devoted to the presentation of light and the basic quantities describing the light and its properties. These quantities are then used to describe the light sources, which is the thesis engaged in in the following section. The light sources are divided into thermal and luminescent. Then, there are described the basic parameters that are monitored when choosing the light source, such as luminous flux, color rendering index, correlated color temperature, mean lifetime, beam angle. Next, the thesis engages in solar radiation, spectrum of radiation, process and the color temperature of daylight and turns to the requirements for the aquarium lighting. According to the requirements for the aquarium lighting, the lighting design is done and it is sought an ideal solution for the aquarium lighting using LEDs. In conclusion of this thesis, there is designed an effective cooling for the LEDs in order to maintain their lifetime and luminous flux as long as possible. Then, it is designed and realized control of the LEDs by the pulse width modulation, prepared software for controlling the lighting depending on the daytime to meet the demands on the aquarium lighting while monitoring the process of the daylight and to look natural.
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Influence of Change in Frequency of the Supply Current to the Operational Parameters of the Discharge Light Sources
Kuptsov, Alexander ; Škoda, Jan (referee) ; Krbal, Michal (advisor)
The master’s thesis is devoted to exploiting of gas-discharge lamps and their dependence on frequency of the supply current. The first part describes the theory of discharge, its types and properties, terms of its origin, and ways of its exploitation. The second part concerns electrical ballast systems of gas discharge light sources, inductive (reactive) and electronic ballasts, principles of their functioning, advantages and disadvantages, and the comparison of their properties. The following chapters deal with low-pressure and high-pressure gas-discharged lamps, compare their properties and describe exploitation of fluorescent lamps. Before conducting laboratory experiments the influence of frequency of the supply current on different properties of gas-discharge lamps was described. Besides, simulation of basic electric parameters of high-pressure gas-discharged lamps was implemented in the program SIMULINK/MATLAB. As a result, the received graphs show the dependence of current, voltage and electric power on time. Another simulation included building of dynamic current-voltage characteristics at various frequencies of the supply current. Preparations for the laboratory experiment and the experiment itself were implemented. Compact and tube low-pressure fluorescent lamps were measured. The received graphs show the influence of change in frequency of the current on the operational parameters of the discharge light sources.
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Glare measurement with a luminance analyser
Kalfus, Petr ; Baxant, Petr (referee) ; Škoda, Jan (advisor)
One of the basic parameters of any lighting is the quality of the illumination design, and how it glares. This paper deals with glare and its evaluation. The basic variables used in its evaluation are described. Methods of evaluating internal glare using various indexes are described. Methods of evaluating glare from daylight and evaluating glare of outdoor systems are also described. The principle of operation of luminance analysers is then described and the school LDA luminance analyser that will be used for the measurements is described. The indoor glare measurements made are described, manually evaluated and calculated and compared with the new automated calculation in the lumiDISP program. The daylight glare and outdoor glare measurements are also described, evaluated and compared with the new automated calculation. Finally, the possibility of measuring glare with a luminance analyser is summarised and the accuracy of the new lumiDISP functions is evaluated
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Phototherapy
Joklík, Vojtěch ; Škoda, Jan (referee) ; Štěpánek, Jaroslav (advisor)
This thesis describes relationship between human body and light. It is focused on perception of light with human eye, skin and their reaction to incident light and its intensity. Then it contains short description of Icterus Neonatorum (yellow-gum), Constitutional Dermatitis, Lepriasis and their treatment. It is followed by description of various sources of light, their use in medicine and reaction of body to them. This work includes measurements and evaluation of five sources of light.
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Interior lighting design
Klement, Roman ; Florián, Michal (referee) ; Škoda, Jan (advisor)
This diploma thesis deals with the design of a virtual prototype of a luminaire. Using suitable software tools, a luminaire optics is created and optimised. Luminaire is simulated in the interior, and lighting parameters are evaluated. Finally a suitable design is created.
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Evaluation of LED replacements
Bordovský, Lukáš ; Pavelka, Tomáš (referee) ; Škoda, Jan (advisor)
The aim of my thesis is to become familiar with LED replacements of light sources, possible problems, advantages and disadvantages. In the work are at first explained terms of light technology. Then are concisely described actual light sources, that can be replaced by LED. That concern: classic bulbs, halogen bulbs, linear fluorescents and compact bulbs. After that is described principle of LED light fittings and advantages, disadvantages nowadays to use LED light fittings. The main emphasis is placed on chapter 5. The compensations of linear fluorescents by LED moduls. The following chapters are dedicated to comparison of fluorescent lamps and LED moduls. Involving-photometrics parameters, luminous intensity, lumniance analysis and also economics comparison of lighting systems with fluorescent lamps versus the LED moduls.
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Photobiological safety of light sources and lighting systems
Štěpánek, Jaroslav ; Krbal, Michal (referee) ; Škoda, Jan (advisor)
The thesis deals with the problems of the photobiological lamp and lamps systems safety. It is divided into theoretical and practical parts. The theoretical part touches the basic knowledge concerning the eye and vision, eye and skin diseases caused by excessive exposure to non-ionizing radiation. And besides that there are described the sources of light causing the possible exposure and further more it includes the methodology of measurement and evaluation of photobiological safety. The practical part investigates a measurement of the spectrum of light sources. The measured data are evaluated according to the methods mentioned in the theoretical part.
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Influence of optical elements on the tubular skylights efficiency
Nekvapil, Jan ; Mohelníková, Jitka (referee) ; Škoda, Jan (advisor)
This thesis deals with the measurement of light tubes efficiency in laboratory conditions during lighting by almost direct light rays. It also deals with the measurement of the spectral reflectance of the reflective materials available on the Czech market. The comparison of the efficiency of different light routes and also the determination of the spectral qualities of different reflective materials are the aims of this thesis. The light tubes were measured by means of the cubic integrator. The light source was moved and manoeuvred by means of the automatic goniophotometer. The light source flow was determined by the method of the zonal flows. The data were calculated in the Matlab programme. The evaluation is both in the graphic and in the numeric forms. The result of the thesis is both the comparison of the reflective materials for light tubes qualities, and the evaluation of efficiency of the assigned light routes. The optimal variant can be then selected during designing of the light tubes route according to the results of the measurements.
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Evaluation of optical components for LED
Dobiáš, Jiří ; Pavelka, Tomáš (referee) ; Škoda, Jan (advisor)
This thesis deals with an evaluation of optical components for LED, which is based on laboratory measurements of available LED samples and optical elements. The evaluation is done according to established standards and is focused on efficiency and adjustment of luminous flux (beam angle, luminous curve). Furthermore was made a study engaged in an optical element influence on LED color properties (color temperature, spectral characteristics). In conclusion there is an optical elements usage overview and recommended procedure for selecting appropriate combination of LED and optical element.
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Use compact control systems to control lighting by DALI protocol
Uchytil, Tomáš ; Baxant, Petr (referee) ; Škoda, Jan (advisor)
This thesis describes the system of lighting control via digital signals. In particular DALI protocol, this is used as a standard in this control. There is description of possibilities of connecting control units and a principal of communication between a load and the control unit. Also this thesis contains the conception of control via compact control systems, where is used a converter RS232/DALI.
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