Bronte Wells
Light pollution is a pressing issue that has compromised human health, disrupted ecosystems, and spoiled aesthetic environments. It is caused by the inefficient or unnecessary use of artificial light, resulting in excessive, misdirected, or obtrusive illumination. The opposite of light pollution, therefore, would be the absence of such pollution, allowing for the preservation of dark night skies and the natural light levels in the outdoor environment. This opposite state, free from the adverse effects of artificial lighting, is what organizations like DarkSky International aim to achieve through their advocacy, education, and certification efforts. By promoting responsible outdoor lighting practices and working with communities to establish codes and statutes, they strive to reduce light pollution and restore the nighttime environment to its natural state, free from the harmful impacts of artificial light sources.
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What You'll Learn
Dark sky movement
The dark sky movement is a worldwide campaign to reduce light pollution and minimize its harmful effects. Light pollution is the human-made alteration of outdoor light levels from those occurring naturally, caused by the inefficient or unnecessary use of artificial light. It competes with starlight, interferes with astronomical observatories, disrupts ecosystems, and has adverse health effects.
The dark sky movement encourages communities to adopt lighting regulations and promote responsible lighting practices. This includes the use of full-cutoff fixtures that minimize light trespass by reducing light that shines upward or past its intended area. The movement also advocates for the use of amber-colored lighting, which helps to reduce the hazy, orange skyglow caused by over-illumination from large city centers, shopping centers, or stadiums.
Dark sky preserves are protected areas, mainly in national parks, that have a zero-light pollution policy enforced by governments. As of 2012, there were 35 recognized dark sky preserves worldwide, with Canada leading the way with 15 preserves. These areas allow visitors to experience a perfect and untouched night sky. The International Dark-Sky Association (IDA) has been instrumental in designating and protecting these preserves, as well as advocating for energy-efficient and well-designed lighting fixtures through political lobbying.
The dark sky movement has seen many successes since its beginnings in the 1950s. The first dark sky legislation was passed in 1958 in Flagstaff, Arizona, where despite a population of over 70,000, effective lighting control measures have kept the skies dark enough to see the Milky Way. DarkSky International, with its 70+ chapters worldwide, has also been a key player, working to restore the nighttime environment, protect communities from light pollution, and promote responsible outdoor lighting through education, advocacy, and conservation.
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Reducing light pollution
Light pollution, also known as photopollution or luminous pollution, is the presence of any excessive, unwanted, misdirected, inefficient, or obtrusive artificial lighting. It is a major side effect of urbanisation and industrial civilisation, with about 83% of people, including 99% of Europeans and Americans, living under light-polluted skies.
The opposite of light pollution would, therefore, be the reduction or absence of these excessive, unwanted, or obtrusive artificial lights. Reducing light pollution involves implementing measures to minimise the negative impacts of artificial lighting on the environment, human health, and astronomy. Here are some ways to reduce light pollution:
Adjusting Light Fixtures and Bulbs
One of the easiest ways to reduce light pollution is to adjust light fixtures and use more appropriate light bulbs. This can include using bulbs with lower wattage, installing shields or covers on fixtures to direct light downward, and using cut-off fixtures that limit light trespass and glare.
Educating the Public and Legislative Change
Educating the public about the harmful effects of light pollution is crucial. By raising awareness, individuals can make informed choices about their lighting practices and support initiatives to reduce light pollution. Additionally, advocating for legislative change can lead to the implementation of lighting ordinances and policies that minimise light pollution. Organisations like DarkSky International work towards establishing lawful requirements for outdoor lighting to reduce its harmful effects.
Responsible Outdoor Lighting
The Five Principles for Responsible Outdoor Lighting, promoted by DarkSky International, provide a holistic approach to reducing light pollution. These principles emphasise using light only when needed, ensuring it serves a clear purpose, and limiting light to the necessary amount and area. This reduces unnecessary lighting, glare, and light trespass.
Collaboration with Professionals
Working collaboratively with city planners, lighting designers, scientists, and industry professionals can lead to the development of effective lighting standards and policies. Organisations like DarkSky International participate in various professional organisations, such as the International Commission on Illumination (CIE) and the Illuminating Engineering Society (IES), to establish lighting standards worldwide.
Conserving Starry Sky Parks
DarkSky International and other organisations work to certify and conserve starry sky parks and communities worldwide. These areas are dedicated to preserving dark skies and protecting them from the negative impacts of light pollution. By supporting and creating more of these spaces, we can reduce light pollution and provide opportunities for people to experience truly dark night skies.
By implementing these measures and working together, we can effectively reduce light pollution, preserve the natural darkness of the night sky, and mitigate the adverse effects on human health, ecosystems, and astronomy.
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Light pollution solutions
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It has been estimated that 83% of the world's population lives under light-polluted skies, and this number is only increasing. Light pollution has a range of adverse effects on human health, wildlife, and the environment, and it is important to take steps to reduce it.
The International Dark-Sky Association and DarkSky International are organizations that work to combat light pollution. DarkSky International has developed a set of expert-approved policy templates that provide ready-to-use solutions to reduce light pollution. They promote a holistic approach to light pollution reduction using the Five Principles for Responsible Outdoor Lighting.
Education and Awareness Campaigns
Education and awareness campaigns can play a crucial role in promoting responsible and sustainable lighting practices. By informing the public about the negative impacts of light pollution and providing information on sustainable lighting practices, communities can encourage individuals to take action and make changes in their own homes and communities. Social media, public campaigns, and educational programs can be effective platforms for raising awareness and educating people about light pollution.
Energy-Efficient Lighting Sources
Transitioning to energy-efficient lighting sources, such as warm-colored LED lights, can significantly reduce energy consumption and costs associated with lighting. LED lights have a longer lifespan and use less energy compared to traditional lighting sources, making them a more sustainable and cost-effective option. This solution can be widely applied in public areas such as parks, streets, and public buildings.
Proper Placement and Design of Lighting Fixtures
The placement and design of lighting fixtures are critical in minimizing light pollution. Thoughtful lighting installations limit light to areas where it is needed and only use the amount of light necessary. This approach helps eliminate unnecessary lighting, reduces glare, and minimizes light trespass and over-illumination. Proper lighting design can also help reduce light spillage into the sky, preserving the visibility of the stars and reducing the negative impacts of sky glow.
Light Control Measures
Implementing light control measures such as motion sensors and timers can help reduce the excessive use of lighting in public areas. By turning off or dimming lights when they are not required, these measures can minimize light pollution and reduce energy consumption. This solution is particularly effective in areas such as parking lots, streets, and public buildings.
Collaboration and Stakeholder Engagement
Collaborative efforts between lighting designers, policymakers, and stakeholders can lead to the development and implementation of lighting standards and regulations that prioritize sustainability and responsible lighting practices. Working together, these groups can address the complex issues associated with public lighting and find innovative solutions that promote a more environmentally friendly urban environment.
By implementing these solutions and working together as communities, it is possible to reduce light pollution and mitigate its harmful effects on human health, wildlife, and the environment.
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Effects of light pollution
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is caused by the inefficient or unnecessary use of artificial light. While light pollution does not have an opposite, its effects can be mitigated and even reversed.
On Human Health
Research suggests that artificial light at night can negatively affect human health, increasing the risks of obesity, depression, sleep disorders, and diabetes and even breast cancer. This is because artificial light can disrupt the natural body clock or circadian rhythm, which guides day and night activities and affects physiological processes in nearly all living organisms. One of these processes is the production of the hormone melatonin, which is released when it is dark and inhibited when there is light. An increased amount of light at night lowers melatonin production, which can result in sleep deprivation, fatigue, headaches, stress, anxiety, and other health problems. Blue light, in particular, has been shown to reduce melatonin levels and is found in cell phones, computers, and energy-efficient light bulbs.
On Wildlife and Ecosystems
Light pollution also has harmful effects on wildlife and ecosystems. Plants and animals depend on Earth's daily cycle of light and dark to govern life-sustaining behaviors such as reproduction, nourishment, sleep, and protection from predators. Nocturnal animals that are active at night have their natural environment radically altered by light pollution, which turns night into day. Predators use light to hunt, and prey species that rely on darkness as cover are left vulnerable. Light pollution has also been shown to impact animal behaviors such as migration patterns, sleep habits, and habitat formation. Sea turtles and birds that are guided by moonlight during migration get confused, lose their way, and often die. Insects, a primary food source for many species, are drawn to artificial lights and are killed upon contact.
On Astronomy
Light pollution competes with starlight, reducing the visibility of the night sky and making it difficult to observe stars and other celestial objects. Sky glow, the bright haze above cities produced by artificial lighting, worsens the visibility of the Milky Way and increases natural light levels at night. With the increasing number of satellites in orbit, astronomers fear that light pollution will only increase, further disrupting their work.
On the Environment
Light pollution is a major side effect of urbanization and industrialization, affecting the aesthetic of natural environments. It is also a contributor to the collective impact of various sources of pollution.
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Light pollution indoors
Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. Although this type of pollution can exist throughout the day, its effects are more pronounced at night due to the contrast with the darkness of the sky. Light pollution is not limited to outdoor settings but can also occur indoors.
Indoor light pollution refers to the excessive or inappropriate use of artificial lighting inside buildings, homes, or other enclosed spaces. This can include various sources such as interior lighting fixtures, electronic devices, and screens. While indoor light pollution may not have the same environmental impacts as outdoor light pollution, it can still have significant effects on human health and well-being.
Research suggests that exposure to artificial light at night, including indoor lighting, can negatively impact human health. Studies have linked indoor artificial light at night to an increased risk of sleep disorders, obesity, depression, and even certain types of cancer. For example, a study in Israel found a correlation between higher levels of outdoor artificial light at night and an increased risk of breast cancer in women.
The light inside homes or indoor spaces and the light emitted by electronic devices can have a more substantial impact on health than outdoor lighting. This is because individuals are typically exposed to indoor lighting for longer durations and at higher light levels. To mitigate the potential health risks associated with indoor light pollution, it is recommended to minimise exposure to light, especially blue light, during the night. This can be achieved by using dimmers, lower-CCT light bulbs, and colour temperature apps that adjust the screen's appearance to the time of day.
Additionally, indoor light pollution can also refer to situations where unwanted light enters a property or indoor space from an external source. This is known as light trespass and can occur when light shines through a window from outside, causing issues such as sleep deprivation. To address indoor light trespass, some cities have developed standards for outdoor lighting to protect citizens' rights and reduce the impact of unwanted light entering their homes.
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Frequently asked questions
The opposite of light pollution is dark sky. Dark sky is a movement that aims to reduce light pollution and protect communities and wildlife from its harmful effects.
Light pollution is the presence of any unwanted, excessive, or inappropriate artificial lighting. It is a human-made alteration of outdoor light levels from those occurring naturally.
Light pollution has multiple adverse consequences, including compromising human health, disrupting ecosystems, and interfering with astronomy by reducing the visibility of stars and the Milky Way.
