Modelování světelného toku vyzařovaného do horního poloprostoru vlivem osvětlovacích soustav venkovního osvětlení

Abstract

The PhD thesis deals with the issue of the obtrusive light from the point of view of modeling large units with outdoor lighting systems. The aim of this work is to verify the various sources of the obtrusive light involved in "light pollution" in outdoor areas based on their quantification. That is the amount of luminous flux radiated to the upper hemisphere from these outdoor lighting systems. These light sources are implemented into the software goniophotometer in the computer program Wils - Building Design. The software goniophotometer was developed in cooperation with VŠB-TU Ostrava and the company Astra MS Software. It allows insert computational points network in the shape of a sphere with computational points showing normal illumination in the direction to the center of the sphere. For the correct function of the software goniophotometer, it is necessary to determine the boundary conditions that do not correspond to standard lighting-technical calculations. The software goniophotometer makes it possible to determine not only the direct part of the luminous flux radiated into the upper hemisphere, but also direct and reflected part using reflecting surfaces respecting the Lambert surfaces. In this work I present a detailed procedure from the determination of the source of the obtrusive light, obtaining the input computational data needed for the quantification of the obtrusive light, to the determination of the total luminous flux radiated to the upper hemisphere. All of this with the developed methodology for modeling the radiation of light sources, which include advertising areas and windows under the assumption of diffuse radiation of these sources. Modeling of radiation of large units, including districts or entire cities, outdoor workspaces, is performed using the proposed methodology in the software goniophotometer. The result of the PhD thesis is a comparison of the behavior of various large light sources in the night outdoor space in terms of quantity, directionality, both in time and space.