scholarly journals Photons without borders: quantifying light pollution transfer between territories

2018 ◽  
Vol 20 (2) ◽  
pp. 51-61 ◽  
Author(s):  
Salvador Bará ◽  
Raul C. Lima
Keyword(s):  
Relative Weight ◽  
Light Pollution ◽  
Artificial Light ◽  
Light Sources ◽  
Accurate Assessment ◽  
Pollution Levels ◽  
The World ◽  
Lighting Systems

The light pollution levels experienced at any given site generally depend on a wide number of artificial light sources distributed throughout the surrounding territory. Since photons can travel long distances before being scattered by the atmosphere, any effective proposal for reducing local light pollution levels needs an accurate assessment of the relative weight of all intervening light sources, including those located tens or even hundreds of km away. In this paper we describe several ways of quantifying and visualizing these relative weights. Particular emphasis is made on the aggregate contribution of the municipalities, which are -in many regions of the world- the administrative bodies primarily responsible for the planning and maintenance of public outdoor lighting systems

scholarly journals Blue light attracts nocturnally migrating birds

The Condor ◽  
2020 ◽  
Vol 122 (2) ◽  
Author(s):  
Xuebing Zhao ◽  
Min Zhang ◽  
Xianli Che ◽  
Fasheng Zou
Keyword(s):  
Blue Light ◽  
Field Experiments ◽  
Red Light ◽  
Light Pollution ◽  
Artificial Light ◽  
Light Sources ◽  
Rapid Urbanization ◽  
Phototactic Response ◽  
Migrating Birds ◽  
The Impact

Abstract Light pollution is increasing and artificial light sources have great impacts on animals. For migrating birds, collisions caused by artificial light pollution are a significant source of mortality. Laboratory studies have demonstrated that birds have different visual sensitivities to different colors of light, but few field experiments have compared birds’ responses to light of different wavelengths. We used 3 monochromatic lights (red, green, and blue) and polychromatic yellow light to study the impact of wavelength on phototaxis at 2 gathering sites of nocturnally migrating birds in Southwest China. For both sites, short-wavelength blue light caused the strongest phototactic response. In contrast, birds were rarely attracted to long-wavelength red light. The attractive effect of blue light was greatest during nights with fog and headwinds. As rapid urbanization and industrialization cause an increase in artificial light, we suggest that switching to longer wavelength lights is a convenient and economically effective way to reduce bird collisions.

scholarly journals A linear systems approach to protect the night sky: implications for current and future regulations

2020 ◽  
Vol 7 (12) ◽  
pp. 201501
Author(s):  
Fabio Falchi ◽  
Salvador Bará
Keyword(s):  
Spatial Planning ◽  
Linear Models ◽  
Systems Approach ◽  
Educational Activity ◽  
Light Pollution ◽  
Negative Consequences ◽  
Pollution Levels ◽  
The World ◽  
Night Sky

The persistent increase of artificial light emissions is causing a progressive brightening of the night sky in most regions of the world. This process is a threat for the long-term sustainability of the scientific and educational activity of ground-based astronomical observatories operating in the optical range. Huge investments in building, scientific and technical workforce, equipment and maintenance can be at risk if the increasing light pollution levels hinder the capability of carrying out the top-level scientific observations for which these key scientific infrastructures were built. Light pollution has other negative consequences, as e.g. biodiversity endangering and the loss of the starry sky for recreational, touristic and preservation of cultural heritage. The traditional light pollution mitigation approach is based on imposing conditions on the photometry of individual sources, but the aggregated effects of all sources in the territory surrounding the observatories are seldom addressed in the regulations. We propose that this approach shall be complemented with a top-down, ambient artificial skyglow immission limits strategy, whereby clear limits are established to the admissible deterioration of the night sky above the observatories. We describe the general form of the indicators that can be employed to this end, and develop linear models relating their values to the artificial emissions across the territory. This approach can be easily applied to other protection needs, like e.g. to protect nocturnal ecosystems, and it is expected to be useful for making informed decisions on public lighting, in the context of wider spatial planning projects.

scholarly journals Challenges and Opportunities Facing Light Pollution: Smart Light-Hub Interreg

Proceedings ◽  
2020 ◽  
Vol 30 (1) ◽  
pp. 63
Author(s):  
Jesús Rodrigo-Comino ◽  
Stephan Seeling ◽  
Christel Egner-Duppich ◽  
Michele Palm ◽  
Manuel Seeger ◽  
...  
Keyword(s):  
Point Of View ◽  
Light Pollution ◽  
Light Sources ◽  
Public Authorities ◽  
Private Companies ◽  
Smart Lighting ◽  
Challenges And Opportunities ◽  
Private And Public ◽  
Lighting Systems ◽  
Negative Impacts

Light pollution is a well-known problem because of its negative impacts on human health, flora, and fauna. From an ecological and engineering point of view, the literature states to consider the following aspects: (1) the light intensity; (2) the composition of the spectrum; (3) the time and duration of lighting to optimize the time of illumination with the available technologies; (4) the periods of lighting and the control cone; (5) the height and spacing between the light sources to optimize the space between the light sources, to reduce the flow of light and unnecessary energy consumption; (6) the environmental impact studies on-site; and (7) the analysis of real needs and less standardized approaches, examining the evolution of use and habits of light consumption. Accordingly, we want to present the SMART LIGHT-HUB (INTERREG) project, which pretends, during the next 3 years (2019–2021), to deliver smart lighting systems to reach the widest possible public, such as companies active in the relevant subject areas. We are setting up an R&D network in the Grande Région (Belgium, Luxembourg, Germany, and France) to facilitate the emergence of new collective solutions to needs that are not addressed in the private and public sectors, in terms of lighting. We are planning exchange workshops, which serve to complete the project, concerning the interested parties on the ground (public authorities, chambers of commerce and industry, local authorities, public–private sector, private companies, etc.) and external participants representing the final consumers. We also want to work on restoring a protected nighttime environment (i.e., continuous areas of “nocturnal/black corridors” for animals that cannot tolerate artificial light).

scholarly journals Yield and antioxidant activity of microgreens Petroselinumcrispum

2020 ◽  
Vol 61 (3) ◽  
pp. 99-104
Author(s):  
Maria I. Ivanova ◽  
◽  
Valery N. Zelenkov ◽  
Vyacheslav V. Latushkin ◽  
Anatoly A. Lapin ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Flavor Compounds ◽  
Artificial Light ◽  
Light Sources ◽  
Herbaceous Plant ◽  
Total Antioxidant Activity ◽  
The World ◽  
Total Antioxidant ◽  
Microclimatic Conditions ◽  
Side Dishes

The paper explores the germination of seeds, yields and an tioxidant properties of microgreens of different varieties and varieties of Petroselinumcrispum (Mill.) Nym. in controlled microclimatic conditions. The most active germination of seeds was observed in the interval of 7-11 days after sowing. The total increase in microgreens in height almost stops after 14 days of germination in the dark. Thus, growing products by germination in the dark is advisable longer than this period to get microgreens promising leafy varieties of parsley. A significant increase in total antioxidant activity in seed germination has been established – 2.7-5.6 times for different varieties. Parsley Petroselinumcrispum (Mill.) Nym. – a herbaceous plant used in many kitchens of the world as spicy and for the preparation of side dishes. The main flavor compounds of parsley are 1.3.8-n-metatrien, apiol, myristicin, and tetramethoxyallbenzene, of which apiol and mydisticin are “toxic in large doses”. Green, herbaceous and fruit notes in parsley are determined by the hex-3-enil, (Z)-hex-3-enol and (Z)-hex-3-enylacerate. It is proposed to use parsley as a component of functional products in the treatment of cancer. Growing parsley microgreens is advisable due to the high antioxidant and other beneficial properties. Despite the slow and time-stretched germination of seeds, within 2 weeks of cultivation formed a fairly high vegetative mass, which can be used for food and medicinal purposes, for example, as a product of functional nutrition. It is possible to grow products in the dark without the use of artificial light sources. The highest yield is provided by leafy varieties of parsley compared to root varieties.

Organic Light Emitting Diodes - Innovative Light Sources

2019 ◽  
pp. 101-107
Author(s):  
Sergei A. Stakharny
Keyword(s):  
Light Source ◽  
Organic Light Emitting Diodes ◽  
Organic Leds ◽  
Light Sources ◽  
High Quality ◽  
Light Emitting ◽  
Organic Light ◽  
Lighting Systems ◽  
Physical Principles ◽  
Prospects Of Application

This article is a review of the new light source – organic LEDs having prospects of application in general and special lighting systems. The article describes physical principles of operation of organic LEDs, their advantages and principal differences from conventional non-organic LEDs and other light sources. Also the article devoted to contemporary achievements and prospects of development of this field in the spheres of both general and museum lighting as well as other spheres where properties of organic LEDs as high-quality light sources may be extremely useful.

Analysis Criteria for Choosing Energy Efficient High-Quality Light Sources and Luminaires

2018 ◽  
pp. 113-119
Author(s):  
Gennady Ya. Vagin ◽  
Eugene B. Solntsev ◽  
Oleg Yu. Malafeev
Keyword(s):  
Energy Efficiency ◽  
Energy Efficient ◽  
National Standards ◽  
Light Sources ◽  
The European Union ◽  
High Quality ◽  
Eu Directive ◽  
The World ◽  
A New Technique ◽  
Energy Labelling

The article analyses critera applying to the choice of energy efficient high quality light sources and luminaires, which are used in Russian domestic and international practice. It is found that national standards GOST P 54993–2012 and GOST P 54992– 2012 contain outdated criteria for determining indices and classes of energy efficiency of light sources and luminaires. They are taken from the 1998 EU Directive #98/11/EU “Electric lamps”, in which LED light sources and discharge lamps of high intensity were not included. A new Regulation of the European Union #874/2012/EU on energy labelling of electric lamps and luminaires, in which these light sources are taken into consideration, contains a new technique of determining classes of energy efficiency and new, higher classes are added. The article has carried out a comparison of calculations of the energy efficiency classes in accordance with GOST P 54993 and with Regulation #874/2012/EU, and it is found out that a calculation using GOST P 54993 gives underrated energy efficiency classes. This can lead to interdiction of export for certain light sources and luminaires, can discredit Russian domestic manufacturer light sources and does not correspond to the rules of the World Trade Organization (WTO).

Design of Solar-Powered LED Road Lighting System

2019 ◽  
pp. 75-85
Author(s):  
Canan Perdahci ◽  
Hamdi Ozkan
Keyword(s):  
High Pressure ◽  
Renewable Energy Sources ◽  
Junction Temperature ◽  
Mercury Vapour ◽  
Light Sources ◽  
Street Lighting ◽  
Led Light ◽  
Road Lighting ◽  
Lighting Systems ◽  
High Pressure Sodium Lamp

Turkey is rich in terms of renewable energy sources and, therefore, is now encouraging the use of sustainable clean lighting systems in road applications. High pressure sodium lamp is the most widely used type in main roads, but other types of lamps such as mercury vapour lamps or metal halide lamps can be utilized for street lighting. Since it enables energy and money saving, LED light technology has replaced high pressure sodium lamps nowadays. Once solar power system (PV) is integrated with LED lamp for street lighting, the amount of saving and local impact might be enriched. LEDs used as light sources in road lighting luminaires with rising lumen values, decreasing junction temperature, higher colour rendering efficiency, longer lifetime have become more efficient than many light sources with the latest developments. Since the structure of the luminaires in which the LED light sources are used differs from that of the conventional light sources, the optical, thermal and electrical design of the LED luminaires must be considered differently. Thus, this study concentrates upon design considerations and the operating principle of solarpowered LED road lighting luminaire in details. Also, a simple solar panel system was designed and the economical values obtained at the end of 20 years were compared when using the ongrid system and the off-grid system.

Hybrid Lighting Complex for Combined Lighting Systems Research Into Optical Path Optimization Using the Complex "Solar Led-S" New Modification

2018 ◽  
pp. 122-129
Author(s):  
Alexander T. Ovcharov ◽  
Yuri N. Selyanin ◽  
Yaroslav V. Antsupov
Keyword(s):  
Light Transmission ◽  
Optical Path ◽  
Artificial Light ◽  
Solar Panels ◽  
Shopping Centre ◽  
Systems Research ◽  
Lower Stage ◽  
Input Structure ◽  
Lighting Systems ◽  
Two Stages

A new concept of the architecture of hybrid lighting systems for installations of combined lighting is considered. The cascade principle of constructing the optical path of such complexes is described, in which the design contains two stages of the cascade: the upper and lower stages. The upper (input) structure is made on the basis of the corresponding modification of the hollow tube “Solatube®” (daylight), and the lower one, based on the “Solatube®” fibre of a larger diameter, is combined with LED artificial light block and is designed to transmit mixed light (daylight and artificial light). The results of studies on the efficiency of light transmission made it possible to optimize the solution of the new modification of the hybrid lighting complex “Solar LED”, lower stage of the cascade, and to develop the nomenclature of the production line “S”. The description of the first experience of using this complex in the pilot combined illumination system of the “meeting room” in the shopping centre “IKEA Belaya Dacha” headquarters is given. A completely autonomous power supply system for a lighting installation based on solar panels has been implemented.

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