Influence of a Light Source Installed in a Luminaire of Opal Sphere Type on the Effect of Light Pollution

Abstract

The article presents the results of the studies concerning the influence of a light source installed in luminaire of opal sphere type on the light pollution effect of the night sky. It is known from literature reports that the effect of light pollution is influenced by the spectral distribution of light. Although the influence of the spectral distribution has been widely studied from different perspectives, there is still a need to study this phenomenon—for example, from the point of view of the spectral reflection properties of the ground, on which the lanterns are installed. Hence, the above-mentioned aspect was considered in the authors’ investigations. The luminaire considered has been equipped with 20 different light sources, including the latest generation of lamps (light-emitting diodes, LEDs) as well as the conventional ones. With respect to these light sources, the measurements of light distribution and spectral distribution of emitted radiation of the luminaire were performed. Having these measurement data, the simulations were carried out using the DIALux software, and the calculations were made using the specially prepared calculation tool. On the basis of the results obtained in this way this was stated that the type of light source installed in the luminaire has a significant effect on the sky glow. An important factor affecting light pollution is not only the value of the luminous flux emitted upward but also the spectral characteristics of the emitted radiation, the impact of which is most noticeable. The conclusions from the studies indicate the next steps in the analysis of the light pollution effect. These steps will be focused on extended analysis of LEDs as modern and developed light sources.

Interactive Timeline Approach for Contextual Spatio-Temporal ECT Data Investigation

“…Previous work on spatio-temporal information visualization reveals a variety of approaches. There are multiple applications that emphasize proper visualization of the measurement data, especially in engineering context; from mechatronics to light and spectral distribution data [39,40]. The scope of proposed applications ranges from mapping of movable 3D visuals onto the localization maps through time, to spatio-temporal visualization methods, including decision making support as well as data intensive applications for emergency management important in handling disaster events [41,42].…”

Influence of Replacement of Sodium Lamps in Park Luminaires with LED Sources of Different Closest Color Temperature on the Effect of Light Pollution and Energy Efficiency

“…One of the most popular luminaires used to illuminate green areas, sidewalks, residential roads, and private areas is an opal sphere-type luminaire [33]. It should be noted without a doubt that such a solution is outdated, but luminaires with such configurations are still being produced.…”

“…Spectral characteristics have been omitted in such studies. In turn, a greater number of light sources (20 pcs) were included in [33], where analysis of the LP effect concerned the actual shapes of photometric solids and spectral distributions as well as the scotopic (night) nature of human vision.…”

A Multi-Criteria Assessment Procedure for Outdoor Lighting at the Design Stage

“…Indeed, artificial light has a great impact on the environment at night in many different ways, which are only briefly mentioned in this paper. An outdoor lighting installation should be analyzed in a more complex manner that takes into account all of the most important factors, e.g., spectral power distributions (SPD) of light sources or luminaires [34][35][36]. The other factors, such as safety, environmental protection and, even more so, economics and aesthetics ought to be considered in parallel.…”