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[IEEE 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Trebic, Czech Republic (2018.9.18-2018.9.20)] 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Factors Having a Crutial Impact on Energy Efficiency of Floodlighitng
摘要： Floodlighting designs have only been analysed in terms of visual and aesthetic beauty up to now. Research in the field of floodlighting has also focused on other aspects of this type of lighting in recent years. The energy efficiency issue and the impact on light pollution are the most crucial aspects. These issues have not yet been properly explored in the literature. Significant factors which affect the issue of the engineering aspect of floodlighting have to be determined and studied carefully because of their high importance. The main aim of this paper is to present the key factors which have a crucial impact on energy efficiency and light pollution in the field of floodlighting. These factors are: the direction and location of the lighting equipment, luminous intensity distribution, light output ratio, the method of floodlighting and the spectral power distribution of a light source, as well as the spectral distribution of the reflectance from the illuminated surface. Each of these factors are precisely commented on. These are presented by means of a calculation, a measurement or a visualization example, which clearly allow the crux of the problem to be analysed in the easiest way. The research shows that the problem of improving floodlighting design in respect of energy efficiency and light pollution is a complex and exacting problem for a lighting designer. It definitely requires the creation of an individual and unified system of assessment. It ought to take into account all the crucial factors and be simple, understandable and easy to use. Development of such a system is underway at the Lighting Technology Division of Warsaw University of Technology. It will soon be finalized in the form of a doctoral dissertation by one of the authors of this paper.
关键词： energy efficiency,lighting technology,floodlighting utilization factor,light pollution,floodlighting
更新于2025-09-23 15:21:21
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Research on Luminance Distributions of Chip-On-Board Light-Emitting Diodes
摘要： Chip-On-Board Light-Emitting Diodes (COB LED) are increasingly more common. Their development in recent years has directly contributed to increasing the power of LED sources, whilst simultaneously increasing the luminous ?ux from the entire COB. Consequently, it has led to new developments in some applications. Information regarding the size of the light source luminous surface and luminance distribution on its surface is critical for a designer whilst designing optical systems. The purpose of this conducted research was to establish to what extent luminance distribution is even on the examined COB LEDs. In order to verify luminance distributions on an LED surface, direct measurements with a matrix luminance measuring device were made. As a result of the research, it has been observed that luminance distribution is not even, and in many cases luminance maximum does not fall in the geometric center of the luminous surface, which was initially expected. So, it has been concluded that while designing optical systems for COB LEDs, irregular luminance distribution on their surface needs to be considered.
关键词： LED,luminance distribution,COB,lighting technology,Chip-On-Board,COB LED,light-emitting diodes,micro LED
更新于2025-09-16 10:30:52
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Lighting up the nighttime
摘要： Artificial light at night needs to be reduced to limit negative environmental impacts. Among the most visually compelling images of the whole Earth have been those created using data obtained at night by astronauts or from satellites. The proliferation in use of electric lighting—including from industrial, commercial, municipal, and domestic sources—is striking. It sketches the spatial distribution of much of the human population, outlining a substantial proportion of the world’s coastline, highlighting a multitude of towns and cities, and drawing the major highways that connect them. The data embodied in these nighttime images have been used to estimate and map levels of energy use, urbanization, and economic activity. They have also been key in focusing attention on the environmental impacts of the artificial light at night itself. Explicit steps need to be taken to limit these impacts, which vary according to the intensity, spectrum, spatial extent, and temporal dynamics of this lighting.
关键词： lighting technology,biological responses,skyglow,artificial light at night,environmental impacts
更新于2025-09-10 09:29:36