Meghan Hodges
Light pollution is a human-made alteration of outdoor light levels from those occurring naturally, causing harmful effects on the environment, wildlife habitats, and human quality of life. It disrupts nocturnal ecosystems, affects the natural rhythms of plants and animals, and poses risks to human health and safety. To control light pollution, individuals, institutions, and governments should take collective action. This includes simple measures such as turning off unnecessary lights, using window shades, and adopting energy-efficient LED lights with appropriate color temperatures. Additionally, communities can advocate for local legislation and work with organizations like DarkSky International to establish codes that reduce light pollution and protect the beauty of the night sky.
| Characteristics | Values |
|---|---|
| Lighting products | Use lighting products that are certified to reduce light pollution. |
| Legislation | Establish codes and statutes that reduce light pollution. |
| Education | Inform the public about the harmful effects of light pollution. |
| Lighting design | Use proper lighting design, such as downward-facing lights, to reduce light trespass onto neighbouring properties. |
| Light bulbs and fixtures | Change light bulbs and fixtures to more energy-efficient options, such as LED lights. |
| Development regulations | Adopt measures governing development around biodiversity and protected areas. |
| Dark sky areas | Create and promote dark sky areas to reduce light pollution. |
| Light direction | Avoid pointing lights upwards and use shades to keep room lights from escaping. |
| Light usage | Turn off unnecessary lights and reduce the use of electronic devices at night. |
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What You'll Learn
Use LED lights
Light pollution is a human-made alteration of outdoor light levels from those occurring naturally. It has been found to harm wildlife, the environment, and our quality of life. One way to reduce light pollution is to use LED lights.
LED lights have advanced quickly in recent years and are now the best type of light to help reduce light pollution. This is because they have a more focused light beam than other types of light, such as fluorescent lights. LED lights are also dimmable, so they can be adjusted to be brighter when necessary, such as when a vehicle approaches. With motion sensors, sections can be lit when activity is detected and dimmed to a minimum when nobody is around.
LED lights also offer energy savings and long-term reliability. However, it is important to limit the luminance and spectrum of the lighting system used and to use shielding to reduce glare and light trespass onto neighbouring properties. It is recommended to avoid the blue light spectrum associated with LED lights that have a higher CCT above 5000K. Instead, opt for warmer colour temperatures with a CCT of less than or equal to 5000K, such as yellow, red, and amber.
One example of the successful implementation of LED lights to reduce light pollution is the city of Dunedin, New Zealand, which changed all its sodium lights to shielded LED lighting.
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Turn off unnecessary lights
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 severely disrupts nocturnal ecosystems, interferes with the natural rhythms of plants and animals, mars the wilderness experience and landscape beauty, carries risks to human health and safety, and wastes energy.
One of the simplest and most effective ways to combat light pollution is to turn off unnecessary lights. This applies to both indoor and outdoor lighting. Here are some specific ways to implement this strategy:
Indoor Lighting
- Get into the habit of turning off lights when leaving a room. This not only reduces light pollution but also lowers your energy costs.
- Use window shades or curtains to prevent indoor light from escaping outside and contributing to light pollution. This practice can also enhance your privacy, especially in close living quarters such as apartment buildings.
- Reduce the use of electronic devices in the evening. The bright screens of devices like computers, laptops, phones, and tablets can contribute significantly to light pollution. Switch to a dimmer night setting on your devices, as this is better for your eyes and reduces light pollution.
- Avoid driving at night if possible. Headlights contribute to light pollution and degrade the night sky.
Outdoor Lighting
- Turn off unnecessary outdoor lights, such as porch or garden lights, when they are not needed.
- Use motion sensors for outdoor lighting. This ensures that lights are only activated when needed, reducing unnecessary light output.
- Use downward-facing lighting fixtures or shields to focus light downwards and prevent light trespass onto neighbouring properties. This reduces light pollution and glare while keeping the desired area illuminated.
By adopting these practices and turning off unnecessary lights, we can significantly reduce light pollution and its negative impacts on the environment and our well-being.
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Use window shades
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It has harmful effects on streetlights, greenhouses, and satellites, among other sources. One of the many ways to control light pollution is to use window shades.
Window shades are a great way to reduce light pollution as they prevent room lights from escaping your house or hotel room and contributing to the light pollution outdoors. This is especially important in close quarters such as hotels or apartment buildings, where your lights can easily disturb your neighbours. By using window shades, you can contain the light within your own space and minimise its impact on the surrounding environment.
Window shades offer a simple and effective solution to light pollution. They are easy to install and can be customised to fit the size and style of your windows. Whether you choose roller shades, roman shades, or another type of window treatment, ensuring that they are made from opaque or light-blocking materials will help to prevent light from escaping through the windows.
Additionally, window shades can provide benefits beyond light pollution control. They can offer privacy, especially in densely populated areas where homes are in close proximity to one another. Window shades can also help regulate the temperature inside your home by blocking out sunlight during hot summer days, potentially reducing the need for air conditioning or other cooling systems.
By adopting the use of window shades, you can play a part in reducing light pollution and its negative impacts on the environment and wildlife. It is a small but significant step towards restoring the natural balance of light in our surroundings and preserving the beauty of the night sky.
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Limit upward-facing lights
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 severely disrupts nocturnal ecosystems, interferes with the natural rhythms of plants and animals, mars the wilderness experience and landscape beauty, carries risks to human health and safety, and wastes energy.
One of the ways to control light pollution is to limit upward-facing lights. Upward-facing lights are a significant contributor to light pollution, as the light shines into the sky instead of onto the intended area. This can be reduced by using fixtures that direct light downward, such as semi-cutoff or full-cutoff wall packs, which are designed to focus light in a specific direction. Light shields can also be attached to existing fixtures to prevent light from escaping upwards and reduce glare.
In addition to using appropriate fixtures, individuals can also reduce upward-facing light pollution by being mindful of their lighting habits. Drawing the curtains or using window shades can prevent indoor lights from shining outdoors. When using flashlights or headlights, individuals should point them towards the ground rather than straight ahead, reducing the amount of light pollution escaping upwards.
Cities and communities can also play a role in limiting upward-facing lights by implementing measures such as using downcasting lights for street lighting. While this may raise safety concerns, a balance can be struck by ensuring that pedestrian walkways are illuminated with smaller lamps that are lower to the ground. This way, upward light pollution can be reduced while still providing adequate lighting for road users and pedestrians.
Furthermore, the use of LED lights can help reduce upward light pollution. LED lights have a more focused light beam compared to other types of lights, reducing the amount of light shining upwards. They are also often dimmable, allowing for lower lighting levels that reduce light pollution while still providing enough light for comfort and safety. With the addition of motion sensors, LED lights can be dimmed when no activity is detected, further minimizing upward light pollution.
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Choose warm colour temperatures
Light pollution is the human-made alteration of outdoor light levels from those occurring naturally. It has harmful effects on streetlights, greenhouses, satellites, and nocturnal ecosystems, and it interferes with the natural rhythms of plants and animals.
One way to control light pollution is to choose warm colour temperatures. Colour temperature is the colour appearance of a light solution output, measured in Kelvin (K) and abbreviated to CCT (correlated colour temperature). Warmer colours, such as reds, oranges, and yellows, have longer wavelengths and lower Kelvin values, ranging from 1500K to 2700K. Cooler colours, such as greens, blues, and purples, have shorter wavelengths and higher Kelvin values, typically above 5000K.
When it comes to reducing light pollution, warmer colour temperatures are preferred. White LED lights, for example, can produce more than eight times the amount of brightness and light pollution compared to warmer-looking lights at the same wattage. This can lead to adverse effects on human and wildlife health, increased light trespass, and disturbed sleep for residents.
To address this issue, some communities have replaced white lights with warmer alternatives. Flagstaff, Arizona, for instance, utilizes warm-coloured LEDs and low-pressure sodium lights. While low-pressure sodium lights are ideal for street lighting, LED lights are more cost-effective. Additionally, adding protective shields to direct light downward can help reduce light spread.
It is important to note that the choice of colour temperature depends on the specific location and purpose. For roadway lighting, visibility and light pollution must be considered together. Warmer colour temperatures may be suitable for residential and rural areas, while other areas may require a range of 0 Kelvin to 2700 Kelvin.
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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 unnecessary, misdirected, or improper artificial outdoor lighting.
Light pollution has several negative impacts. It severely disrupts nocturnal ecosystems, interferes with the natural rhythms of plants and animals, mars the wilderness experience and landscape beauty, carries risks to human health and safety, and wastes energy.
Light pollution can be controlled by:
- Using window shades to prevent room lights from escaping.
- Reducing the use of devices in the evening and switching to a dimmer night setting.
- Using headlights sparingly when driving at night.
- Pointing flashlights and headlights downwards.
- Using LED lights with motion sensors, which can be dimmed when no activity is detected.
- Using semi-cutoff or full-cutoff wall packs that focus light downward.
- Adopting lighting ordinances at a local level.
