User-Centric Measures of the Perceived Light Qualities of Lighting Products

Nowadays, lighting planning is predominantly determined by the need to meet physically measurable requirements that are often based on current lighting standards. However, meeting the minimum technical requirements of the standards is no guarantee for a visually appealing light environment. Instead, requirements based on perceived light qualities also need to be included to achieve better user comfort. Taking perception-based qualities into consideration when creating a light environment is, for many, not an easy task. In addition, a common terminology for perceived light qualities is currently lacking, both in industry and in research. The aim of this paper is, therefore, to explore how perceived light qualities of white light sources can be described when employing user-centric measures. The focus was on the qualities of light colour and diffuse and distinct light since these qualities have a great impact on the visual impression of light. The perception was assessed by applying analytical sensory analysis to lighting products, a method found to be promising in previous work. The methodology is based on analytical measurement by the human senses, which is particularly valuable when developing a general terminology. Since sensory analysis is still quite new to the topic of lighting, the applicability of using the methodology to assess lighting in a real context was also investigated. The results of the studies showed that the perception of light qualities can be described using further concepts in addition to those currently used. For light colour, the concepts of reddish, bluish, yellowish, and greenish light colours proved suitable for providing a richer description of the quality. The concepts of diffuse and distinct light satisfactorily captured variations in light contrast produced by shadows, reflections, and sparkles. In addition, the studies revealed that analytical sensory analysis was applicable for assessing the perception of lighting in a real-world context. The latter means that knowledge gained in the laboratory can be translated into real environments. The user-centric measures investigated in this paper have contributed to the terminology related to perceived light qualities. These can complement the physical measures in lighting planning to promote light environments that are not only energy efficient and meet technical requirements, but also cater for increased user comfort. Doi: 10.28991/ESJ-2023-07-02-022 Full Text: PD

R(e)flect : The reflective teaching material about energy, behaviour and product development

r(e)flect is a tangible curriculum kit for students age 10-15 to reflect on energy behaviour and make better informed choices about energy use. Along with web-based material, the kit includes a minicomputer, smart plugs (sensors), and an electricity visualization tool especially designed to be used in the classroom to conduct experiments and measurements, perform project work in product development, and increase the understanding of the kWh concept. The curriculum is closely connected to the new Swedish National curriculum and supplies the teachers with appropriate support for assessment of different skills. The project was initiated in 2011 and a first version of the curriculum was tested and evaluated with students and teachers. The feedback from this trial influenced the second iteration of the kit. The new version will be tested in at least 20 schools during the spring of 2014 and this second phase will continue until 2015. The physical r(e)flect material can be borrowed by teachers free of charge, and the web-based platform is open and accessible to anyone

Учебная программа по учебной дисциплине "Теория обработки металлов давлением"

Учебная программа "Теория обработки металлов давлением" кафедры "Металлургия и технологии обработки материалов" для дневной формы получения образования: общее количество часов-270, трудоемкость учебной дисциплины — 6 з.е., форма контроля знаний — экзамен

Bright Communication : Lighting communication with focus on perception and energy

In order to promote an efficient use of energyfor lighting, while putting the user's perception and light comfort in focus,this project has developed methods and tools to communicate light and lighting.To ensure that light environments are designed from a user perspective,existing definitions of light quality, which are mainly based on technicalterms, have been supplemented with concepts and definitions of visual and emotionalcharacter of light. The lighting industry and professional purchasers have beeninvolved in all phases of the project in order to develop methods and toolsthat are well-grounded and applicable by different actors involved in theprocess from light planning to the implementation of lighting environments. Lighting accounts for a significant part of the total energy use in buildings,about 20 per cent for households and 40 per cent for premises. The energysaving potential is thus high. Moreover, Europe is facing a shift towards moreenergy efficient lighting as a result of both regulations and technologydevelopment. Still, Swedish consumers tend to prefer incandescent light, as itis perceived to provide better comfort compared to modern light sources.Therefore, in order to motivate property owners and consumers to convert tomore energy-efficient products, it is necessary to focus more on the visual andemotional qualities of light. Today, however, knowledge, concepts and tools to communicateand measure visual light quality are lacking. This challenge has been the motivationand starting point for the development of methods for assessing objective andsubjective light qualities for light sources, luminaires and light environmentswithin this project and to translate the results into tools targeting theindustry. The project has developed a draft communication tool based on the humanperception of light quality. The tool aims to constitute a neutralcommunication point and to supports both the lighting industry and professionalpurchaser, and thus also the end user. By reducing misunderstandings andincreasing the consensus between actors in different parts of the process fromlight planning to implementation, the tool is expected to promote lightenvironments that are both energy-efficient and provide attractive perceptionand comfort.I syfte att främja effektiv användning av energiför belysning, samtidigt som brukarens upplevelse och ljuskomfort sätts ifokus, har detta projekt utvecklat metoder och verktyg för att kommunicera kringljus och belysning. För att tillgodose att ljusmiljöer utformas utifrån ettbrukarperspektiv har dagens existerande definitioner av ljuskvalitet, somhuvudsakligen bygger på tekniska och fysikaliska termer, kompletterats medbegrepp och definitioner av ljusets visuella och emotionella karaktär. Genom ennära samverkan med både belysningsbranschen och beställare i projektetssamtliga faser har målet varit att utveckla metoder och verktyg som är väl förankradeoch tillämpbara av olika aktörer involverade i processen från ljusplanering tillimplementering och utvärdering av nya ljusmiljöer. Belysning står för enbetydande del av den totala energianvändningen i byggnader, runt 20 procent förhushåll och 40 procent för lokaler. Energibesparingspotentialen är hög ochEuropa befinner sig i ett skifte mot mer energieffektiv belysning som följd avbåde regler och teknikutveckling. Samtidigt tenderar svenska konsumenterfortfarande att föredra glödljus, eftersom det upplevs ge en bättre komfort änljuset från moderna ljuskällor. För att motivera fastighetsägare ochkonsumenter att byta till mer energieffektiva produkter är det därförnödvändigt att fokusera mer på ljusets visuella och emotionella kvaliteter.Idag saknas dock kunskap, begrepp och verktyg för att kommunicera och mätavisuell ljuskvalitet. Det är denna utmaning som projektet har avsett möta genommetoder för att bedöma objektiva och subjektiva ljuskvaliteter för ljuskällor,armaturer och ljusmiljöer och omsätta resultaten i verktyg riktade mot branschen.Projektet har tagit fram en skiss för ett kommunikationsverktyg som baseras på upplevelsemåttav ljuskvalitet. Verktyget fungerar som en neutral kommunikationspunkt ochstödjer såväl belysningsbranschen som beställare, och därmed ävenslutanvändaren. Genom att minska missförstånden och öka samsynen mellan aktöreri olika delar processen från ljusplanering till implementering väntas verktygetfrämja ljusmiljöer som både är energieffektiva och skapar en god upplevelse ochkomfort.Arbetet som beskrivs i denna rapport har genomförts inom ramen för Energimyndighetensprogram EELYS – Energieffektivisering inom belysningsområdet. Projektet ”Bright Communication: Belysningskommunikationmed fokus på perception och energi” (paraplynamnet Swedish Research Project on Perceptual Metrics for Lighting Design används för detta och relateradeprojekt) har genomförts i samarbete mellan RISE, Lunds Tekniska Högskola och Högskolan Kristianstad.Swedish Research Project on Perceptual Metrics for Lighting Desig

User-centric measuers of perceived light quality : development of tools to promote energy efficient lighting

The aim of the research presented is to support the implementation of light environments that cater both energy efficiency and well-being by providing tools that support communication about perceived lighting quality between professionals in lighting design and procurement.Bright Communicatio