Nighttime in the forests in Luxembourg’s north. When the inhabitants of Clervaux and Vianden turn off their lights, go to bed in search of restorative sleep, the forests are dark, and foxes, owls and bats sharpen their senses. Their eyes are used to hunting prey in the dark, their movements adapted to the black that surrounds them, the only source of light being stars and moon.

These nocturnal animals have a major problem. For decades, the night sky has become brighter and brighter, even in the North of the country, the less industrial area in Luxembourg. Last year, the Nature Park Our concluded a pilot project to reduce light pollution. On Local Matters, we had Laurent Spithovel on our microphone yesterday, leader of the EU-funded project Night Light. He explained us the impact of light pollution for the nature, and animals in particular.

Today, our guest is Daniel Gliedner. Daniel Gliedner is lighting counselor for the Nature Park Our. He knows that not only animals suffer from too much light in the night, but the human biorhythm as well. In our interview, he tells us how lighting can be improved and why this is necessary.