Brian Barton
Light pollution, caused by excessive or poorly designed artificial lighting, has a detrimental impact on the environment, wildlife, and human health. It disrupts the natural behaviour of nocturnal animals and insects, affecting their breeding patterns and migration, and can also negatively impact human sleeping patterns. With only 10% of people in the UK able to view a truly dark sky today, compared to over half in the 1950s, it is important to take steps to reduce light pollution. These include using window shades to prevent room lights from escaping, reducing the use of electronic devices in the evening, and switching to low-watt or warm-white LED bulbs for outdoor lighting.
| Characteristics | Values |
|---|---|
| Lighting fixtures | Use fixtures that shield the light source to minimize glare and light trespass. |
| Lighting type | Switch to LED lighting, which reduces illuminance without compromising visibility. Avoid blue lights, as they worsen sky glow and increase glare. |
| Lighting usage | Turn off unnecessary indoor lighting, especially in empty buildings at night, to prevent light leakage into the night sky. |
| Outdoor lighting | Only install outdoor lighting if absolutely necessary. Ensure lights are fully shielded and directed downwards. |
| Lighting design | Choose well-designed lamps that minimize light loss above the horizon, reducing the artificial glow that brightens the night sky. |
| Community action | Work with communities to establish codes and statutes that reduce light pollution through proper lighting design and usage. |
| Education | Inform the public about how excessive artificial light can harm humans, wildlife, and the climate. |
| Device usage | Reduce the use of electronic devices in the evening, and switch to dimmer night settings when possible, to minimize light pollution. |
| Window shades | Use window shades to prevent room lights from escaping and contributing to outdoor light pollution. |
| Driving | Avoid driving at night, as headlights contribute to light pollution and degrade the night sky. |
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What You'll Learn
Minimise indoor light pollution
Minimising indoor light pollution is an important step in reducing overall light pollution. Here are some ways to achieve this:
Firstly, it is essential to turn off unnecessary indoor lighting, especially in empty buildings at night. This simple action prevents interior light from leaking into the night sky and contributing to light pollution. It also reduces energy costs, providing a financial incentive to complement the environmental benefits.
Secondly, the use of window shades is recommended to block indoor light from escaping through windows. This practice not only helps reduce light pollution but also enhances privacy, particularly in close living quarters such as apartment buildings.
Another significant source of indoor light pollution is electronic devices such as computers, laptops, tablets, and phones. To mitigate this, it is advisable to switch to dimmer night settings on these devices after dark, as the bright screen lights are not needed during nighttime hours. Reducing the use of these devices in the evening is also beneficial.
In addition to these measures, it is worth noting that the type of indoor lighting fixtures can play a role in minimising light pollution. It is preferable to use shielded lighting fixtures that minimise glare and light trespass. Switching to LED lighting is also advantageous, as it allows for reduced illuminance without compromising visibility. However, it is important to avoid blue-rich white light sources, as they tend to worsen sky glow, increase glare, and negatively impact human vision.
By implementing these strategies, individuals can significantly reduce indoor light pollution, contributing to a cleaner and more beautiful night sky for all to enjoy.
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Avoid blue light
Blue light from electronic devices and energy-efficient light bulbs can negatively impact your health and sleep. Research has shown that exposure to blue light at night may contribute to the causation of cancer, diabetes, heart disease, and obesity.
To avoid blue light from electronic devices, you can adjust your device settings. For example, if you have an iPhone, iPad, or Mac, you can enable the Night Shift feature to change the colour temperature of your screen and filter out blue light. Windows PCs have a similar feature called Night Light, and most Android devices have built-in blue light filters. Alternatively, you can download third-party apps that filter out blue light, such as Blue Light Filter, sFilter, or Twilight. These apps allow you to adjust the colour temperature, intensity, and brightness of your screen to reduce blue light exposure.
You can also invest in computer glasses with special lenses that lower blue light exposure. These glasses have yellow-tinted lenses that increase contrast on your screen, filter blue light, and reduce digital eye strain. Additionally, lenses with anti-reflective coatings can reduce glare, increase contrast, and block blue light.
To avoid blue light from indoor lighting, get in the habit of using window shades to prevent room lights from escaping your house and contributing to light pollution outdoors. You can also try to reduce your use of electronic devices in the evening, as the bright lights from screens can interfere with your sleep and the night sky. Remember, natural darkness should be the default at night, and artificial light should be used only when necessary.
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Use window shades
Light pollution is a human-made alteration of outdoor light levels from those occurring naturally. It is excessive, misdirected, or misused light that can harm human health, wildlife, ecosystems, and astronomy. One way to avoid contributing to light pollution is to use window shades.
Window shades can be used to keep room lights from escaping your house or hotel room at night, thus reducing light pollution outdoors. This also allows for privacy, especially in close quarters such as apartment buildings. It is important to use opaque fabrics, as they can completely block light from escaping into the night. Light gaps can also be reduced by employing "L", "H", or "U"-shaped side and bottom channels, which will leave only indirect, diffused light visible from the exterior. Dual roller shading systems are another option, with a light-filtering fabric on the front roller for use during the day, and an opaque fabric on the back roller for a complete blackout at night.
To ensure that shades are closed at night, they can be tied into a building automation system or controlled by timers. This is especially useful for offices and other commercial buildings, where people may not remember to close the shades before leaving for the day.
In addition to using window shades, there are other ways to reduce light pollution, such as switching to LED lighting, turning off unnecessary indoor lighting, and minimizing the use of electronic devices after dark.
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Limit screen time
Light pollution is a human-made alteration of outdoor light levels from those occurring naturally. It has harmful effects on the environment, wildlife habitats, and our quality of life. To avoid light pollution, it is important to limit screen time. Here are some ways to do that:
- After dark, switch your devices to a dimmer night setting. This reduces light pollution and is also healthier for your eyes.
- Reduce the use of devices in the evening.
- Make it a rule to unplug completely after dinner.
- Avoid using devices with screens that emit blue light, as this worsens sky glow and increases glare, compromising human vision.
- Use window shades to keep room lights from escaping your house or hotel room, as this contributes to light pollution outdoors.
By limiting screen time and following these suggestions, you can help reduce light pollution and protect your health, the environment, and your quality of life.
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Install outdoor lights only when necessary
Light pollution is a human-made alteration of outdoor light levels from those occurring naturally. It has harmful effects on the environment, wildlife habitats, and our quality of life. It disrupts the health and well-being of humans and wildlife alike. It also affects the migration of birds and the breeding patterns of nocturnal animals and insects.
To avoid light pollution, it is recommended to install outdoor lights only when necessary. Here are some ways to do that:
Firstly, it is important to assess the need for outdoor lighting. Ask yourself if the lighting is truly required for safety or security purposes. Consider alternative solutions, such as motion-sensor lights or time switches, which provide illumination only when needed.
Secondly, when installing outdoor lights, opt for low-wattage bulbs or LED lamps with a warm-white light. Avoid blue-rich white light sources, as they increase glare and compromise human vision. Blue light also worsens sky glow due to its larger geographic reach. Instead, warm-white lighting can provide better illumination while reducing light pollution, as seen in the Spanish city of Vélez-Málaga.
Thirdly, ensure that outdoor lights are fully shielded and directed downwards. Use fixtures with 'full cut-off flat glass' fitments, so no glass is visible beneath the lamp's cover. This minimizes glare and light trespass, helping to prevent light pollution.
Lastly, be mindful of your surroundings and the potential impact on wildlife. Consult guidelines, such as the National Light Pollution Guidelines for Wildlife, to understand how light can affect different species. Monitor artificial lighting and animal behaviour to ensure that light pollution is sufficiently mitigated in your community.
By following these steps, you can effectively reduce light pollution by installing outdoor lights only when necessary and minimizing their impact on the environment and wildlife.
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Frequently asked questions
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It is caused by inappropriate, excessive, or poorly designed artificial lighting.
Light pollution disrupts the health and well-being of humans and wildlife. It can negatively impact sleeping patterns, cause a hazardous glare, and disrupt ecosystems' natural day and night cycles. It can also suppress melatonin production and affect the migration of birds and the breeding patterns of nocturnal animals and insects.
There are several ways to reduce light pollution. Firstly, avoid unnecessary lighting, both indoors and outdoors. When using lighting, opt for low-watt bulbs and warm-white lighting instead of bluish-white lighting. Ensure that outdoor lights are fully shielded and directed downwards, and only switched on when necessary.
The use of devices such as computers, laptops, phones, and tablets can contribute to light pollution, especially when used after dark. Switching to a dimmer night setting and reducing the use of these devices in the evening can help mitigate this issue.
To prevent light pollution at home, use window shades to prevent room lights from escaping your house. When using flashlights or headlights, point them downwards to minimize their impact on the night sky.
