Meghan Hodges
Light pollution is the 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. Light pollution interferes with the natural rhythms of plants and animals, mars the wilderness experience, carries risks to human health and safety, and wastes energy. To lessen light pollution, individuals, institutions, and governments should take actions such as changing light bulbs and fixtures, adopting measures governing development around biodiversity and protected areas, and creating and promoting dark-sky areas. LEDs and compact fluorescents (CFLs) can help reduce light pollution and protect the environment, but only warm-colored bulbs should be used. Additionally, outdoor lights should be avoided unless necessary, and when used, they should be fully shielded and directed downwards.
| Characteristics | Values |
|---|---|
| Lighting type | Use white light low-energy LED lamps. Avoid orange or pink sodium lights. Use warm-coloured bulbs. |
| Direction of light | Ensure all outdoor lights are fully shielded and directed downwards. |
| Usage | Only switch on outdoor lights when necessary. Avoid 'dusk to dawn' lamps and use movement sensor lights or time switches. |
| Legislation | Advocate for local legislation to reduce light pollution. |
| Education | Raise awareness of the negative impacts of light pollution and the need to limit luminance, spectrum, and glare. |
| Dark sky areas | Support and promote the creation of Dark Sky reserves and parks to protect naturally dark areas. |
| Energy consumption | Reduce the number of lights and choose energy-efficient options to decrease carbon emissions. |
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What You'll Learn
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 streetlights, greenhouses, satellites, and wildlife habitats. Light pollution can be mitigated by installing outdoor lights only when necessary.
Firstly, it is important to assess whether outdoor lighting is truly required. In some cases, alternative solutions such as reflective surfaces or strategic landscaping may provide sufficient illumination or security without the need for additional light sources. This approach not only reduces light pollution but also conserves energy and minimizes potential negative impacts on the environment.
If outdoor lighting is indeed necessary, it is essential to carefully consider the type, placement, and usage of the lights. Opt for low-energy LED lamps that emit white light, as these are more energy-efficient and have a lesser impact on the environment. Avoid orange or pink sodium lights, which have an urbanizing effect and are less energy-efficient. Ensure that the lights are fully shielded and directed downward to minimize light trespass onto neighbouring properties and reduce glare.
Additionally, use motion sensors or timers to activate the outdoor lights only when needed. This ensures that the lights are not left on unnecessarily, reducing light pollution and conserving energy. By combining thoughtful design, appropriate technology, and mindful usage, it is possible to strike a balance between providing adequate outdoor lighting and minimizing light pollution.
Taking these steps to reduce light pollution not only helps protect the environment and wildlife but also restores the beauty of dark skies, allowing us to reconnect with the wonder of the night sky and the immensity of space.
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Use white light low-energy LED lamps
Light pollution is a pressing issue that has harmful effects on the environment, wildlife, and human health. While LED lights are energy-efficient, they can contribute to light pollution, especially those with higher proportions of blue wavelengths. To mitigate this issue, it is recommended to use white light low-energy LED lamps with warmer colour temperatures. Here are some reasons why this is a good strategy to reduce light pollution:
White light low-energy LED lamps with warmer colour temperatures can help reduce light pollution by minimising blue light emissions. Blue light can have negative impacts on human health, disrupting circadian rhythms and lowering immune system performance. It is important to choose LED lights with warmer-coloured hues, such as yellow or amber, which have less blue light. This can be achieved by selecting LED lights with a colour temperature below 4000 Kelvin, with lower temperatures having even less blue light content. For example, LED lights at 3000 Kelvin have about 21% blue light content.
Additionally, warmer-coloured LED lights scatter less in the atmosphere than cooler blue light, reducing their impact on the night sky. This is particularly important as light pollution obscures the beauty of the night sky and takes away from the awe-inspiring experience of observing the vastness of space. By using white light low-energy LED lamps with warmer colour temperatures, we can reduce the amount of light scattering and preserve the visibility of the stars.
Furthermore, using white light low-energy LED lamps with warmer colour temperatures can help reduce energy consumption. LED lights are known for their energy efficiency, but the warmer-coloured options are even more efficient due to their reduced blue light content. This not only helps reduce light pollution but also contributes to overall energy conservation efforts.
It is worth noting that while using white light low-energy LED lamps with warmer colour temperatures is a step in the right direction, it may not completely eliminate light pollution. Directing the light beams downwards can help further reduce their impact, ensuring that the light does not bounce off the ground and contribute to light pollution.
In conclusion, adopting the use of white light low-energy LED lamps with warmer colour temperatures is a recommended strategy to reduce light pollution. By minimising blue light emissions, reducing their impact on human health and the night sky, conserving energy, and directing the light beams downwards, we can make significant progress in mitigating light pollution and its associated negative consequences.
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Shield outdoor lights and direct downwards
Shielding outdoor lights is an important step in reducing light pollution. Light pollution is a human-made alteration of outdoor light levels from those occurring naturally, and it has harmful effects on streetlights, greenhouses, satellites, and more. It can also interfere with plant pollination and reproduction and negatively impact the foraging and reproductive habits of amphibians.
A fully shielded (full cut-off) light fixture has a solid barrier (cap) at the top of the fixture where the lamp (bulb) is located. The fixture is angled so that the lamp is not visible below the barrier (no light is visible below the horizontal angle). This design prevents light trespass, glare, and sky glow. Light trespass occurs when light shines onto neighbouring properties, causing an unpleasant glare and affecting sleep. Glare is the direct view of a light source against a dark background, which can cause discomfort or temporary blindness. Sky glow prevents us from enjoying the beauty of the night sky.
To prevent these issues, shielded lights are designed to funnel light downwards, away from the night sky. When choosing light bulbs, it is important to consider how much light they will emit. Lower-lumen bulbs will emit less light into the sky but are still bright enough for home use. It is also important to note that purchasing shielded lights designed by the manufacturer is the safest and most effective way to shield lights. Retroactively fitting shields can interfere with the light's inner wiring and cooling processes, posing a fire risk.
In addition to shielding, the use of timers and sensors can minimise unnecessary lighting. It is also important to only install outdoor lights if they are really needed and to only switch them on when absolutely necessary.
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Avoid 'dusk to dawn' lamps
Dusk-to-dawn lamps are outdoor light fixtures that switch on at sunset and off at sunrise. They are equipped with sensors, known as photocells or photosensors, that detect changes in light levels, turning on when natural light starts to fade at dusk and switching off as daylight breaks at dawn. These lamps are designed to automatically illuminate dark areas around your property, enhancing security and convenience.
While dusk-to-dawn lamps offer benefits such as enhanced security and convenience, they can contribute to light pollution if not properly managed. Light pollution is the human-made alteration of outdoor light levels from their natural state, causing harm to the environment, wildlife habitats, and our quality of life. It disrupts nocturnal ecosystems, interferes with plant and animal behaviours, and poses risks to human health and safety.
To lessen light pollution, it is recommended to avoid the use of dusk-to-dawn lamps and instead opt for alternative lighting solutions. Here are some suggestions:
- Install outdoor lights only if necessary: Assess if outdoor lighting is truly required. The best way to prevent light pollution is to minimise the use of outdoor lights.
- Use alternative lighting options: Choose white light, low-energy LED lamps instead of dusk-to-dawn lamps. Avoid orange or pink sodium lights, which are less energy-efficient and have an urbanising effect.
- Implement motion sensor lights: Opt for 'PIR' movement sensor lights or time switches instead of dusk-to-dawn lamps. These lights will only activate when motion is detected, reducing unnecessary light pollution.
- Shield and direct lighting downwards: Ensure any outdoor lights are fully shielded and directed downwards to minimise light trespass onto neighbouring properties and reduce glare.
- Minimise light usage: Practice conscious usage of outdoor lighting. Only turn on lights when absolutely necessary, and consider using timers or schedules to automatically turn lights off after a certain duration.
By following these suggestions and choosing alternative lighting options, you can help lessen light pollution caused by dusk-to-dawn lamps while still maintaining security and functionality in your outdoor spaces.
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Support Dark Sky legislation
Light pollution is a human-made alteration of outdoor light levels from those occurring naturally. It has harmful effects on streetlights, greenhouses, and satellites, among other sources. Light pollution is harmful to the environment, wildlife habitats, and our quality of life. It also poses risks to human health and safety and wastes energy.
The Dark Sky movement has had many successes, starting with the first-ever dark sky legislation in 1958. Dark Sky, or DarkSky International, works to restore the nighttime environment and protect communities and wildlife from light pollution. They advocate for policy priorities that reduce light pollution and promote quality outdoor lighting. They also certify lighting products, designs, and installations that reduce light pollution.
Dark Sky works with communities and professionals to establish codes and statutes that reduce light pollution. They inform the public about how excessive artificial light can harm humans, wildlife, and the climate. They also provide education and outreach about dark skies and promote responsible and sustainable tourism opportunities in designated dark sky places.
You can support Dark Sky legislation by becoming a Nighthawk, which is a monthly membership that is the most sustainable way to support Dark Sky. You can also make a one-time donation to support their strategic initiatives. Additionally, you can join their email list to stay informed about their latest news, events, and volunteer opportunities.
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Frequently asked questions
Light pollution is the 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.
Light pollution can disturb migrating birds, sea turtles, and other nocturnal species, interfering with their natural behaviours, navigation, mating habits, and sleep cycles. It can also affect human health and safety, waste energy, and take away the wonder of beautiful night skies.
Only install outdoor lights if they are really needed. Use white light, low-energy LED lamps with shielding to direct the light downwards, and avoid lights that are left on for long periods, such as 'dusk to dawn' lamps.
Organisations like Dark Sky International and the International Dark Sky Association work to establish codes, statutes, and protected areas that reduce light pollution. Individuals can support these organisations and advocate for local legislation to address light pollution in their communities.
The city of Dunedin, New Zealand, replaced its sodium lights with shielded LED lighting, and many of the UK's national parks, such as Exmoor and the Brecon Beacons, are designated Dark Sky reserves, protecting their naturally dark skies.
