Návrh metodiky pro měření VO v oblasti mezopického vidění

Abstract

The aim of this thesis is to create a reliable methodology for an evaluation of light parameters of public lighting in the field of mesopic vision. A new approach to a quality evaluation of public lighting in the field of mesopic vision should contribute to increase safety on public roads and to increase a visual performance of road-users, which can be reached by using a suitable lighting source. As a part of the optimization of the design of public lighting systems using a suitable choice of light source, it is also possible to achieve a reduction in the electrical input of these systems, which also leads to a reduction in electricity consumption. The public lighting is a specific case of lighting systems when the observer is in the area with a relatively low adaptation luminance. This means that the light parameters (luminance, illuminance) of the lighting system are not rated according to the photopic curve of human eye sensitivity but according to the curves that are found in the mesopic area of sensitivity. The maximum sensitivity of this curve is dependent on the amount of adaptation luminance where the observer is. Several lighting parameters measurements of public lighting were accomplished to compare the differences between the photopic and mesopic values of the light parameters. Roads with various levels of illumination, adaptation luminance of background and, of course, with various light sources with different correlated colour temperatures were selected for the measurement.