Radiation to the Upper Hemisphere from Large Light Sources Modeling

Abstract

ABSTRACT: Article targets to show potential of software goniophotometer from point of view calculation of the luminous flux leads to upper hemisphere from road lighting system. Basis for this model is building in vyskovice. The thesis further focuses on modeling of radiation in the upper-half space from public lighting system, billboards, cars and windows. The calculation is done for the vyskovice region where the buildings, roads, pavements etc., are designed using AutoCAD as accurate as possible for maximum efficiency of calculation. The purpose of a goniophotometer is to measure luminous intensity or luminous intensity curves. The principle of a goniophotometer is that it allows measuring the luminous intensity in different planes and in different angles, which can be easily interpreted by a sphere with a network of calculation points. The goal of implementing such a network of calculation points is to extend the possibilities of a computational program for modeling the luminous intensity curves of existing luminaires as well as new luminaires. The main goal is calculating the radiation of the luminous flux flowing into the upper half from the outdoor lighting system. Based on the testing, it will be possible to create model of lighting system in city by inserting LDT data of real luminaires. From the resulting model it will be possible to quantify the proportion of the direct and indirect luminous flux flowing into the upper half space.