Biologically active lighting uses blue light to affect biological processes in the human body in the same way as natural light. The human body is constantly adjusting to various changes in the environment. The aim of this thesis is to develop a luminaire for biologically active lighting and to conduct the measurements of the emitted light. By changing the correlated color temperature of the light, emitted by the luminaire throughout the day, we can help our body synchronize biological processes with the day and night cycle. The luminaire is suitable for both living and working spaces. The primary purpose of developing such a luminaire is the improvement of well-being and productivity of people who spend most of their time exposed exclusively to artificial light. One of the problems in the last decades is the excessive exposure of people to blue light in the evening. With developed luminaire, we can regulate the amount of blue light to help users sleep better. Another important feature of the luminaire for biologically active lighting is that it provides adequate illumination of the room. The luminaire has the ability to adjust the luminous flux and correlated color temperature of the light. By manually adjusting the luminaire, we can ensure adequate illuminance and correct correlated color temperature needed for a specific activity. The realization of such a luminaire is most feasible using a combination of light-emitting diodes and a suitable light diffuser. In this way we can achieve compactness of the luminaire, appropriate energy efficiency, adequate light distribution and flexibility in light adjustment.
The first chapter in this thesis is introductory. The second chapter describes the effects of light on the human body. The third chapter describes the fields of use and purpose of biologically active lighting. Chapter four specifies the requirements for luminaire for biologically active lighting. The fifth chapter describes the main characteristics of the light-emitting diodes and the parameters that are important for developing the luminaire for biologically active lighting. The sixth chapter describes the individual components of the luminaire, the mean of communication and the development of a computer program for controlling the luminaire. Chapter seven covers the presentation of measurements performed on the luminaire and findings based on these measurements. Chapter eight describes possible improvements to the luminaire and its potential use in combination with other applications. The final or ninth chapter summarizes the main findings of this master's thesis.
A prototype luminaire for biologically active lighting has been successfully developed. Based on the results of the measurements, we can conclude that the objectives set were largely met. The luminaire is capable of achieving high values of color rendering index throughout a wide range of adjustable correlated color temperature of the light. The main disadvantage is slightly lower values of the luminous flux than initially predicted.
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