What is light pollution?

Urban light pollution can be roughly divided into three categories: white light pollution, artificial sunlight pollution and colored light pollution.

White light pollution: when the sun is shining strongly, glass curtain walls, polished marble, glazed tile walls and various paints reflect light, which is bright and dazzling. Experts have found that working in a light-polluted environment for a long time will damage the retina and iris, make vision drop sharply, increase the probability of cataract, make patients dizzy and even suffer from the disease. Insomnia, loss of appetite, depression and weakness. Symptoms like neurasthenia.

Artificial daylight: After nightfall, advertising lights and neon lights in shopping malls and hotels are dazzling. Some high-speed lights are scattered in the night sky of the city, which is called artificial sunlight, making the city a "city that never sleeps", affecting people's sleep quality, disturbing the biological clock and reducing the quality of life and work in the weather. Artificial sunlight will also affect the normal living environment of other biological communities.

Color light pollution: In some colorful and dynamic architectural lighting projects, the intensity of light generated by lighting is higher than that of sunlight. If people are active in this environment for a long time, it will be harmful to the human body, which will induce nosebleeds, tooth loss, cataracts and even lead to cancers such as leukemia. The flashing of colored lights is not only harmful to the eyes, but also affects the central nervous system of the brain, leading to dizziness, nausea and vomiting, insomnia and other symptoms. Color light pollution is harmful to people's physiological function and mental health.

Lighting can change the image of a city, but each piece of lighting needs to be planned well. Unreasonable urban lighting projects not only affect human life, waste resources, but also interfere with other biological circles. Reasonable planning of urban lighting engineering is the premise of creating beautiful urban night scenes. No matter how beautiful the city lights are in the middle of the night, there is no time or eyes to enjoy them.