The UJI addresses light pollution in the events held to mark the International Day of Light 2023



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## The UJI addresses light pollution in the events held to mark the International Day of Light 2023

16/05/2023 |
SCP

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* [![ dia-internacional-llum 2023-05-05-dia_internacional_llum_EVR67](/com/investigacio/arxiu/noticies/2023/5/dia-internacional-llum/2023-05-05-dia_internacional_llum_EVR67.jpg)](#)

The Universitat Jaume I of Castelló has celebrated the International Day of Light 2023 with several activities such as two conferences on light pollution and demonstrations of optical effects that, this year, have also included electrical technology and a photographic competition. The event was organised by the Castelló Optics Research Group, of the Department of Physics and the Institute of New Imaging Technologies (INIT), and by the Department of Industrial Systems Engineering and Design, which includes the area of Electrical Engineering.

The presentation of the celebration day was chaired by the director of the School of Technology and Experimental Sciences, Ana Piquer, the vice-director of the Degree in Electrical Engineering, Hèctor Beltrán, and the professor of Optics, Vicent Climent. Then, the first speaker, Salvador Bará, from the University of Santiago de Compostela, gave a lecture entitled "Light Pollution: Why Do We Call It Pollution?"

Bará remarked that "artificial light is one of mankind's best inventions, but it is a pollutant" because it has harmful effects on human beings, the natural environment and cultural heritage. In his opinion, its usefulness does not justify overexposing the planet to "more photons per cubic metre in the atmosphere than under normal conditions" because the consequences have negative effects on metabolism, the connection between habitats or astronomical observation. For this reason, he considers that "it should be used in a more sensible way" because, in addition, more than 80% of it is lost.

The researcher Alejandro Sánchez, from the Complutense University of Madrid then gave the lecture entitled "Night-Time Mapping (Light Pollution Seen from the Sky)", where he showed the differences between the images obtained by different mapping systems. Sánchez listed some of the databases of images from space that could be useful for studying this problem, such as space agencies, and that would also provide information on other areas such as sea or air routes, illegal fishing or wildfires.

In his opinion, "to fight against light pollution is also to fight against climate change", which is why he believes that legislation should also be introduced in this area and solutions should be found that allow us to be sustainable. Finally, he encouraged the public to participate in the citizen science project Cities at Night, an initiative that uses a three-stage technique to tag, locate and georeference night-time images.

Those attending the commemoration event also had the opportunity to see some optical phenomena with a number of experiments and a technical display of light bulbs with different types of light. Finally, the Vice-Rector for Innovation, Transfer and Science Outreach, David Cabedo, and the director of the School of Technology and Experimental Sciences, Ana Piquer, awarded the prizes for the photography competition.

1st prize: Sara Gallego. Hot-air balloon (reflected light).

1st runner-up: Belén Cardona. Perfect matches (scattering of sunlight).

2nd runner-up: Luis Ordóñez. On the back of a winged giant (absence of light pollution).

3rd runner-up: Santiago Ochando. Tinença de Benifassà (reflected light).

The event was organised in collaboration with trainee researchers from the Students Chapter of Optics of Castelló (OCAS) and SPIE in Spain, the School of Technology and Experimental Sciences, the Institute of New Imaging Technologies and the offices of the vice-rectors for Innovation, Transfer and Science Outreach and for Students and Healthy Living.

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