The project will catalyse further cooperation between the research community established in the COST Action ES1204 (Loss of the Night Network) in terms of international relations. The recognition of Hungarian research is indicated by the fact that one of the most important international conference series of the topic, "Light Pollution: Theory, Modelling, and Measurements", after Canada and Spain, were invited to organise Hungary in 2019. It is of paramount importance for the established research community that the collaborations undertaken can operate under a common platform. And for the Consortium, it is a unique opportunity to take it forward as the project manager. With these backgrounds, it is guaranteed that further international cooperation can be developed during the duration of the application. In order to ensure the international embedding of the research described below, we plan two international workshops per year during the duration of the application. The professional activities carried out with the help of the tender are structured around two main directions: (1) Continue international and domestic light pollution surveys, (2) establish a model public lighting project. Both projects are structured in such a way that they help to develop international cooperation. The natural synergy between the two sub-projects is the measurement of light pollution to the environment under different conditions (lighting, colour temperature) and biological monitoring of the environment through the sample project. In the field of light pollution surveys, we consider it important to launch in parallel the implementation of a planned measure of the National Landscape Strategy. We will start measuring the light pollution status of protected natural areas and national parks and recording the current conditions. Cross-border national parks where cross-border areas are explored in cooperation with neighbouring countries are very important. We plan to monitor the light pollution of other sites in international cooperation. A model modernisation of the public lighting of two small settlements will be carried out from the project. Currently, there are no widely used equipment that can optimally solve the task and, in addition, have controllable properties that are important from a research point of view. It is therefore necessary to develop appropriate luminaires in a targeted way as part of the programme. In the system to be developed, the luminous flux and colour temperature can be controlled. The sample projects are carried out in a protected, non-pollution environment. This means that in addition to the optimal lighting implemented, a “municipality and its surroundings” laboratory will be created during the term of the application, which is suitable for launching and carrying out internationally significant, innovative research projects involving foreign partners. Among these projects, the following are of particular importance: The light load caused by public lighting, the monitoring of the luminance distribution of the sky according to lighting parameters, biological monitoring in the surroundings of the settlement, the detection of changes depending on the lighting environment. In the lighting environment we enable longer-term measurement and biological monitoring campaigns by foreign researchers. In order to harmonise measurement procedures, we organise international comparison campaigns to ensure that measurements at different locations are comparable and calibrated. In addition to biomonitoring in the natural environment, e.g. testing the frequency of active insects and birds at night using light traps and measuring the intensity of the bird, laboratory animal tests are also planned, where the adverse effects of light pollution on animal behaviour and orientation can be investigated under controlled conditions. As part of this biomonitoring, we plan to measure by imaging polarimetry the polarisation characteristics of the night sky illuminated by moonlight and their change due to light pollution. With the help of the project, the objectives of light pollution, which are also highlighted in the 2017-2026 National Landscape Strategy, can also be achieved, as it includes “national survey of light load (e.g. by determining the luminance distribution of the sky) and the assessment of light load status” among the necessary governmental and academic/research measures. The landscape strategy also deals with the lighting of settlements: a special measure is included in the Communication "Design and design of light-free municipal street lighting: improving the geometry of lighting, applying a colour temperature below 2700K." For some of the planned tasks, the tender (GINOP 2.3.3-15) provides the infrastructure background. From the other tender, we will build a world-class mobile laboratory with which we can launch light pollution surveys. With the help of the current tender, the mobile metering option is complem...