International Journal of Sustainable Lighting <p><strong>Introduction</strong></p> <p>The International Journal of Sustainable Lighting (IJSL) is the successor of the former Ingineria Iluminatului - Journal of Lighting Engineering, issued in Romania starting with 1999. IJSL aims to become an internationally recognized journal and to complement the existing prestigious lighting journals with an emphasis on emerging lighting issues including light pollution, chronobiology, sustainable buildings by extending its readers and authors to the worldwide lighting communities. The IJSL is an open access journal and is published bi-annaully in June, and December each year.</p> <p><strong>Aims and Scope</strong></p> <p>The International Journal of Sustainable Lighting is based on a change of paradigm from energy-efficiency to trans-disciplinarity (including energy, ecology, biology, green buildings, astronomy); it is a peer reviewed scientific journal encompassing experimental, theoretical and applied research results with respect to field of sustainable lighting. It provides a forum for architects, engineers, biologists and researchers involved in the design, operation, construction and utilization of lighting.</p> <p>The foremost objective is to give a quality online publication to our readers and authors. In this pursuit, our effort focuses upon quality publishing and an unquestioned commitment to the highest standards of professional and corporate ethics.</p> <p><strong>Editors-in-Chief</strong></p> <p>Jeong Tai Kim, Professor, Kyung Hee University, Republic of Korea</p> <p>Dorin Beu, Professor, Technical University of Cluj-Napoca, Romania</p> <p><strong>Executive Editor</strong></p> <p>Geun Young Yun, Associate Professor, Kyung Hee University, Republic of Korea</p> <p>&nbsp;</p> <p>&nbsp;</p> International Journal of Sustainable Lighting en-US International Journal of Sustainable Lighting 2586-1247 <p>All International Journal of Sustainable Lighting (IJSL) content is Open Access, meaning it is accessible online without fee under the terms of the Creative Commons Attribution License ( &nbsp;For any reuse, redistribution, or reproduction of a work, users must clarify the license terms under which the work was produced. Neither the text itself nor the ideas presented in it may be used for commercial purposes.</p> Direct assessment of the sensitivity drift of SQM sensors installed outdoors <p>Long-term monitoring of the evolution of the artificial night sky brightness is a key tool for developing science-informed public policies and assessing the efficacy of light pollution mitigation measures. Detecting the underlying artificial brightness trend is a challenging task, since the typical night sky brightness signal shows a large variability with characteristic time scales ranging from seconds to years. In order to effectively isolate the weak signature of the effect of interest, determining the potential long term drifts of the radiance sensing systems is crucial. If these drifts can be adequately characterized, the raw measurements could be easily corrected for them and transformed to a consistent scale. In this short note we report on the progressive darkening of the signal recorded by SQM detectors belonging to several monitoring networks, permanently installed outdoors for periods ranging from several months to several years. The sensitivity drifts were estimated by means of parallel measurements made at the beginning and at the end of the evaluation periods using reference detectors of the same kind that were little or no exposed to weathering in the intervening time. Our preliminary results suggest that SQM detectors installed outdoors steadily increase their readings at an average rate of +0.034 mag<sub>SQM</sub>/arcsec<sup>2</sup> per MWh/m<sup>2</sup> of exposure to solar horizontal global irradiation, that for our locations translates into approximately +0.05 to +0.06 mag<sub>SQM</sub>/arcsec<sup>2</sup> per year.</p> Salvador Bará Enric Marco Salvador J. Ribas Manuel Garcia Gil Alejandro Sánchez de Miguel Jaime Zamorano Copyright (c) 2021 Salvador Bará, Enric Marco, Salvador J. Ribas, Manuel Garcia Gil, Alejandro Sánchez de Miguel, Jaime Zamorano 2021-04-16 2021-04-16 23 1 1 6 10.26607/ijsl.v23i1.109 The GONet (Ground Observing Network) Camera: An Inexpensive Light Pollution Monitoring System <p>Instrumentation developed to monitor and characterize light pollution from the ground has helped frame our understanding of the impacts of artificial light at night (ALAN) [Bará, Lima, &amp; Zamorano, 2019; Hänel et al., 2018; Zamorano et al., 2017]. All-sky imaging has been used to quantify and characterize ALAN in a variety of environments [D. M. Duriscoe, 2016; Jechow, Kyba, &amp; Hölker, 2019]. Over the past decade growth in access to DIY electronics has afforded the opportunity for the development of new and affordable instrumentation for ALAN research. The GONet (Ground Observing Network) camera is an inexpensive (~USD 100), simple to use, all-sky imaging system designed to allow measurements of sky quality at night. Due to their ease of use and low price, GONet cameras allow observations by users with little technical expertise, large inter-comparison campaigns and deployments of opportunity. Developed as a student engineering project at the Adler Planetarium, initial field tests of the GONet system have demonstrated its utility as a tool that can benefit ALAN research. Here we present an overview of the design and use of the GONet device, methods of calibration, initial results from observations, potential use cases, and limitations of the system. What we describe here is the version 1 GONet camera. We conclude with a brief description of the version 2 unit already under development.</p> Ken Walczak Grace Crim Thane Gesite Salome Habtemichael Jack Morgan Cynthia Tarr Laris Turkic Jeff Wiedemann Copyright (c) 2021 Ken Walczak, Grace Crim, Thane Gesite, Salome Habtemichael, Jack Morgan, Cynthia Tarr, Laris Turkic, Jeff Wiedemann 2021-05-10 2021-05-10 23 1 7 19 10.26607/ijsl.v23i1.105 Light Pollution Mapping from a Stratospheric High-Altitude Balloon Platform <p>The NITELite (Night Imaging of Terrestrial Environments Lite) system is a method of collecting regional-scale light emissions data from a latex high-altitude balloon (LHAB) platform. An LHAB can reach altitudes of 25-30km from where the nighttime imaging is performed. LHAB missions are relatively low cost (&lt;$2000US/flight) and easy to repeat. A NITELite mission collects data with high resolution (&lt;10m/px), color information (RGB) over a region of thousands of square kilometers. This system provides a new source of data for remote sensing of artificial light at night (ALAN) research, filling the data gap between aerial and satellite observations. Nighttime LHAB-based imaging can provide data to support fields of ALAN research such as observation of real-time variability, monitoring effects of seasonal changes and events of interest, and measuring angular dependence of ALAN sources. NITELite includes an imaging system, an inertial and positional recording on-board-computer, and an altitude control system. Preliminary results demonstrate the potential of this method for future ALAN research.</p> Ken Walczak Geza Gyuk Jesus Garcia Cynthia Tarr Copyright (c) 2021 Ken Walczak, Geza Gyuk, Jesus Garcia, Cynthia Tarr 2021-05-10 2021-05-10 23 1 20 32 10.26607/ijsl.v23i1.106 LuMinAves: cooperative research and mitigation of light pollution impacts in seabirds <p>Any efforts to conduct a sustainable management of urban and natural landscapes benefit from an interdisciplinary approach and active collaboration between actors, thus increasing the feasibility and effectiveness of the proposed actions. With the emergent transition of urban lighting to white LED technology, such shifts can bring a variety of negative effects to these environments, thus such actions should be applied taking into account as broad a knowledge set as available. These are often fragmented and incoherent thus in need of actions which unite them into usable and common tools. In the North Atlantic region of Macaronesia, a project has been implemented which uses the negative effects light pollution has on seabird populations as a base to effect changes in the regional lighting schemes, decreasing light pollution and increasing the sustainability of the current LED transition, improving practices and awareness, to the benefit of both seabirds and human populations alike.</p> Elizabeth Atchoi Airam Rodríguez Tânia Pipa Carlos Silva Azucena Martín Yarci Acosta Cátia Gouveia Gilberto Carreira Sofia Garcia Dília Menezes Copyright (c) 2021 Elizabeth Atchoi, Airam Rodríguez, Tânia Pipa, Carlos Silva, Azucena Martín, Yarci Acosta, Cátia Gouveia, Gilberto Carreira, Sofia Garcia, Dília Menezes 2021-05-10 2021-05-10 23 1 33 41 10.26607/ijsl.v23i1.107 User-oriented nightscape lighting (UONL) <p>User-oriented design is a method in which user's needs and comfort are met along with his comfort in design process. Lighting of some buildings and urban elements is done for the purpose of attracting audiences in urban nightscape, however the expectations of the users are not thoroughly met. In this paper, user expectations from nightscape are investigated through visual and perceptual attention approach and it's far beyond visual comfort. Therefore, the key question is around; what are the factors affecting user oriented nightscape lighting based on attention?</p> <p>To answer the research question, two places of nightscape with different visual elements in Ab va Atash park are selected. Using survey and eye-tracking techniques, the relationship between different variables of visual attention and attention restoration as perceptual dimension was obtained. Also, by determining the visual preferences, the relation between lighting the elements of landscape with promoting the nightscape based on attention approach was investigated. Finally, a conceptual model of user oriented nightscape based on user attention is presented.</p> Maedeh Pourfathollah Mohammadhavad Mahdavinejad Mojtaba Ansari Hosna Shams dolatabadi Maryam Arbab Copyright (c) 2021 Maedeh Pourfathollah, Mohammadhavad Mahdavinejad, Mojtaba Ansari, Hosna Shams dolatabadi, Maryam Arbab 2021-05-10 2021-05-10 23 1 42 50