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> Satellite Observations Show Reductions in Light Emissions at International Dark Sky Places During 2012-2020 <p>Hyde et al. previously examined the trends in light emission measured by satellite for 98 communities located in or near areas certified as “International Dark Sky Places” (IDSP), and did not find evidence of a difference in trends in comparison to 98 communities of similar size located further away. Here we re-examine the satellite dataset, making use of a newly available correction for the radiance of atmospheric airglow, and extending the analysis period by an additional two years. The new dataset is consistent with the hypothesis that light emissions tend to decrease in communities in or near certified IDSP (median value of -1.6% per year), and is in tension with the hypothesis that there is no difference between these communities and others located further away (median increase of +0.1% per year). While the null hypothesis of no difference in the certified regions still cannot be entirely ruled out (Kolmogorov-Smirnov test probability of 2.5%), it appears likely that IDSP certification is associated with changes in light emissions.</p> Christopher C. M. Kyba Jacqueline Coesfeld Copyright (c) 2021 Christopher C. M. Kyba, Jacqueline Coesfeld 2021-10-25 2021-10-25 23 2 51 57 10.26607/ijsl.v23i2.111 Can we illuminate our cities and (still) see the stars? <p>Could we enjoy starry skies in our cities again? Arguably yes. The actual number of visible stars will depend, among other factors, on the spatial density of the overall city light emissions. In this paper it is shown that reasonably dark skies could be achieved in urban settings, even at the center of large metropolitan areas, if the light emissions are kept within admissible levels and direct glare from the light sources is avoided. These results may support the adoption of science-informed, democratic public decisions on the use of light in our municipalities, with the goal of recovering the possibility of contemplating the night sky everywhere in our planet.</p> <p>&nbsp;</p> <p><em>&nbsp;</em></p> Salvador Bará Fabio Falchi Raul C. Lima Martin Pawley Copyright (c) 2021 Salvador Bará, Fabio Falchi, Raul C. Lima, Martin Pawley 2021-10-25 2021-10-25 23 2 58 69 10.26607/ijsl.v23i2.113 Dark Acupuncture <p>This paper outlines a research methodology and design strategy aimed at realizing sustainable lighting within (sub)urban multi-functional parks. It does so by detailing the research process, as well as resultant vision and design concepts, for the Delftse Hout (a park in Delft, The Netherlands). This process included formulating value-level design requirements, undertaking a detailed site-study to understand stakeholder needs, and combining these to provide conceptual and practical grounding for the future development of a lighting masterplan. A key – and we argue generalizable – outcome of the process is the development and application of dark acupuncture, a scalable design strategy aimed at strategically-placed interventions of darkness and illumination. The paper thus provides three contributions to sustainable lighting theory and practice: a detailed case study of innovative lighting design research; the refinement of dark acupuncture as a design strategy for nature-inclusive park lighting (which itself can be more broadly applicable to urban lighting policy and design); and, as a practical example of transdisciplinary research into artificial light at night.</p> Talyor Stone Iris Dijkstra Tomas Danielse Copyright (c) 2021 Talyor Stone, Iris Dijkstra, Tomas Danielse 2021-10-25 2021-10-25 23 2 70 87 10.26607/ijsl.v23i2.112