Brian Barton
Light pollution is a pressing issue that affects people, animals, and the environment. It is caused by the inefficient, unnecessary, or excessive use of artificial outdoor lighting, such as streetlights, building lights, and advertising lights, which shine directly upwards into the sky. This results in reduced night sky visibility, disrupted biological rhythms, wasted energy, and other harmful consequences. Light pollution has far-reaching impacts, with approximately 83% of the world's population living under light-polluted skies and only the most remote regions, such as Siberia, the Sahara, and the Amazon, remaining unaffected. Addressing light pollution involves implementing solutions like shielded lights, dimmers, and timers, as well as pushing for legislative changes to reduce light trespass, over-illumination, and sky glow.
| Characteristics | Values |
|---|---|
| Definition | Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. |
| Sources | Boats, buildings, street lights, fireworks, automobiles, warehouses, gas and oil production, and satellites. |
| Impact | Reduced night sky visibility, interrupted circadian rhythms, waste of energy resources, health issues, and ecosystem disruption. |
| Solutions | Use shielded lights, less powerful lamps, dimmers, motion sensors, timers, and ambient lighting. |
| Global Statistics | 83% of people, including 99% of Europeans and Americans, live under light-polluted skies. |
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What You'll Learn
Light trespass
To prevent light trespass, it is essential to consider the placement and type of lighting fixtures used. Firstly, it is recommended to aim lights downwards and away from neighbouring houses and windows. Using directional lighting fixtures with adjustable features allows for better control over the angle and distance of the light, ensuring that it illuminates only the intended area. Shielded fixtures are also effective in minimising light spillage and preventing light from escaping into unwanted areas.
Additionally, incorporating motion-sensor lights is a useful strategy to ensure that outdoor lighting is activated only when necessary. This not only reduces the potential impact on neighbours but also conserves energy. Another consideration is brightness; opting for dimmable lights or lower-wattage bulbs can help maintain a balance between achieving lighting goals and ensuring the comfort of nearby residents.
Before installing outdoor lighting, it is advisable to develop a comprehensive lighting plan that outlines the placement and type of lighting to be used. This proactive approach can help minimise the potential for light trespass and foster goodwill within the community. It is also important to maintain open communication with neighbours, sharing lighting plans beforehand to address any concerns and ensure everyone's needs are considered.
If you are experiencing light trespass, the first step is to directly contact the responsible party, which is usually a neighbour, a small business owner, or a larger entity such as a government agency. It is recommended to approach this situation in a positive and non-threatening manner, as working together to find a solution creates a positive atmosphere that benefits the entire community.
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Over-illumination
Light pollution is a global issue that affects 83% of the world's population, with 99% of Europeans and Americans living under light-polluted skies. It is caused by the inefficient and unnecessary use of artificial light, with outdoor electrical lighting being a major contributor.
For example, cities and urban areas are often the biggest contributors to light pollution due to the high concentration of artificial light sources. However, rural areas can also experience over-illumination through unshielded light fixtures that cause glare and upward scattered light. A single offending light source can often fall into multiple categories of light pollution, such as light trespass and skyglow.
The negative consequences of over-illumination are significant. It can lead to reduced night sky visibility, interrupting the natural circadian rhythms of both humans and animals. This disruption can cause sleep disorders, such as insomnia, and impact the health and well-being of those affected. Additionally, over-illumination results in a waste of energy resources, contributing to air pollution and the economic impact of wasted lighting costs.
To address over-illumination, it is important to implement solutions such as adjusting light fixtures, using more appropriate light bulbs, and utilizing shielded lights or full cut-off fixtures that direct light downward. These improvements in lighting design can greatly enhance the quality of the night sky while also providing benefits such as better visibility, improved safety, reduced sky glow, and lower energy consumption.
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Glare
Light pollution is a global issue that has been caused by the world's ever-expanding reliance on outdoor electrical lights. It is a human-made alteration of outdoor light levels from those occurring naturally. Light pollution can come in several forms, one of which is glare.
The light emitted just above the horizontal is the most likely to cause light pollution. Light that grazes across the Earth's surface is several times more damaging than light that is emitted straight upward. This is why light fixtures that direct all light downward greatly reduce the amount of light pollution. These are referred to as shielded lights or full cut-off lights.
To reduce glare, it is recommended to adjust the type of lights used so that the light waves emitted are less likely to cause severe light pollution problems. For example, orange sodium lamps are less prone to showing the "glare" and "fog" phenomenon compared to mercury, metal halide, and blue-light LED road luminaires.
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Light clutter
Light pollution, also known as luminous or photo pollution, is caused by the inefficient, unnecessary, or excessive use of artificial outdoor lighting. This results in reduced night sky visibility, interrupted circadian rhythms, wasted energy resources, and other negative consequences. It is estimated that 83% of the world's population lives under light-polluted skies, with 99% of Europeans and Americans experiencing this issue.
To address light clutter, it is essential to implement measures that reduce light pollution. This can include adjusting light fixtures to direct light downward, using shielded or full cut-off lights, and employing less powerful lamps or bulbs. Additionally, utilising timers, motion sensors, and dimmers can help reduce light output when not needed. By implementing these solutions, we can minimise light clutter and its negative impacts, improving visibility, safety, energy efficiency, and the overall well-being of both people and wildlife.
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Sky glow
Light pollution, also known as sky glow, is a pressing issue that has been a concern to the astronomical community for decades. Sky glow refers to the brightening of the night sky, predominantly over urban areas, due to various sources of artificial light. These sources include electric lights from cars, streetlamps, offices, factories, outdoor advertising, and buildings. The impact of sky glow is such that it turns night into day for people living and working in these illuminated areas.
The problem of sky glow is not limited to a single country, group, or industry but is a global issue resulting from the world's increasing reliance on outdoor electrical lighting. This phenomenon has various detrimental effects. Firstly, it diminishes the aesthetic beauty of a starry night sky, impacting the work of astronomers and disrupting ecosystems. Secondly, it leads to a waste of energy and resources, as excessive or uncontrolled lighting is produced. Finally, it affects both human health and the biological systems of nocturnal wildlife, such as birds, who rely on the moon's polarization signal for navigation.
The light from these various sources scatters via collisions with air molecules, dust particles, pollution, and water droplets, contributing to the brightening of the night sky. Research indicates that when viewed from nearby, about half of sky glow arises from direct upward emissions, such as light shining directly from fixtures, while the other half comes from reflected light. The ratio of these two components can vary depending on factors such as lighting fixtures, usage, and distance from the observation point.
To combat sky glow, it is recommended to use shielded lights or full cut-off fixtures that direct all light downward, reducing the amount of light pollution. Additionally, using less powerful lamps or bulbs can also help mitigate the issue. These modern lighting improvements not only enhance the quality of the night sky but also offer benefits such as better visibility, improved safety, reduced energy consumption, and improved aesthetics.
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Frequently asked questions
Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. It is caused by the inefficient or unnecessary use of artificial light.
Light pollution is a global issue and there is no single country, group, or industry to blame. It is a result of the whole world's ever-expanding reliance on outdoor electrical lights. Sources of light pollution include street lights, buildings, boats, fireworks, and satellites.
Light pollution can cause sleep disorders by disrupting the body's melatonin production. It can also lead to the degeneration of rhodopsin, a photopigment in the eye's rods, resulting in poor night vision. Light pollution also affects the natural behaviour of animals, such as their feeding habits and sleeping patterns.
Solutions to light pollution include adjusting light fixtures, using shielded lights or more appropriate light bulbs, and installing dimmers, motion sensors, and timers. It is also important to turn off lights when they are not needed.
Light pollution has negative environmental and economic impacts. It disrupts ecosystems, compromises health, and affects astronomy. It also leads to a waste of energy resources, with the International Dark-Sky Association estimating that one-third of all lighting is wasted at an annual cost of $2.2 billion.
