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Light pollution laws in France, Germany, and Chile restrict skyward-facing luminaires, change house and commercial facades, reduce energy waste, and aim to protect sleep, biodiversity, and astronomical observation
In France, Germany, and Chile, light pollution laws restrict skyward-facing luminaires and promote Dark Sky lighting, targeting waste, ecosystems, and nocturnal rest.
What changes with Dark Sky lighting
The rules control the quantity, direction, and color of outdoor artificial light. They aim to reduce diffuse glow over cities and villages, which obscures stars and interferes with the biological rhythms of people, plants, and animals.
Dark Sky lighting uses wall sconces and poles with directional shields, casting light only downwards. Open luminaires are replaced by shielded beam models in homes and businesses.
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The standards follow guidelines from the International Dark-Sky Association, IDA. The “Dark Sky Friendly” seal requires upward emission of less than 0.5%, a maximum temperature of 3000K, and dimming.
France adopted rule in force since 2019
France applied the Decree of December 27, 2018, in force since January 2019. The regulation defined technical requirements for outdoor lighting in public spaces.
The decree created nighttime curfews. Monument facades must be turned off by 11 PM, while parking areas can remain lit until 2 AM.
Germany targeted insects and public facades
In Germany, the Federal Nature Conservation Act was amended in August 2021 to include measures against light pollution. The focus was on protecting insects affected by artificial night light.
Baden-Württemberg and Bavaria advanced with their own restrictions. In Baden-Württemberg, state law prohibits the illumination of public building facades after 11 PM.
In Bavaria, the law prohibits skyward-facing spotlights. These measures reduce wasted light and reinforce Dark Sky lighting as the outdoor standard.
Chile extended the restriction to the entire country
Chile, home to some of the darkest skies on the planet, approved a national lighting standard in October 2023.
The Chilean rule controls external emissions, restricts the blue spectrum in astronomical protection areas, and includes biodiversity and human health as objects of legal protection.
Artificial light is now treated as an environmental and well-being factor.
Why upward light became a problem
Light that escapes upwards does not illuminate useful surfaces. It represents wasted energy and contributes to changes in ecosystems, especially for nocturnal species.
A 2017 study showed that the interaction between plants and pollinators drops by 62% at night in areas with strong artificial lighting. Disoriented moths and bees stop visiting flowers to orbit lamps.
The problem also affects migratory birds, reptiles, and amphibians. By blocking upward emission, light shines from top to bottom, like sunlight during the day.
Facades become softer and less intrusive
In adapted neighborhoods, wall sconces no longer have exposed glass facing upwards and now use opaque covers. The beam forms a closed cone towards the ground.
This design prevents dazzling glare that previously invaded neighboring windows. Dark Sky lighting creates localized light, enhances the volumes and textures of buildings, and reduces visual competition with the night sky.
To be Dark Sky Friendly, a luminaire must have a ULOR of less than 0.5%, warm white light up to 3000K, dimming of at least 10%, and shielding above the horizontal plane.
Sleep and health enter the center of the discussion
Artificial night light suppresses melatonin, a hormone that signals to the body when it’s time to sleep. This interference alters circadian rhythms linked to sunrise and sunset.
A study published in Nature Mental Health in October 2023, with over 86,000 participants, showed that nighttime light disturbs these rhythms and increases the risk of psychiatric disorders and depression.
When outdoor light is directed only towards the ground, the brightness in bedroom windows decreases. With less light intrusion, residences recover some of the physiological darkness necessary for sleep.
Regulation must advance in new regions
Similar regulations should advance in countries near astronomical observatories or sensitive ecosystems. Europe is discussing light pollution limits in the energy efficiency directive for buildings.
With Dark Sky lighting, the night is no longer occupied by wasted light and recovers some of its natural darkness.
With information from Monitor do Mercado.
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