Helena Joyce
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. Light pollution is caused by unnecessary, misdirected, or improper artificial outdoor lighting. Fortunately, there are many ways to reduce light pollution. For instance, LEDs and compact fluorescents (CFLs) can help reduce energy use and protect the environment, but only warm-colored bulbs should be used. Dimmers, motion sensors, and timers can also help to reduce average illumination levels and save energy. Outdoor lighting fixtures that shield the light source to minimize glare and light trespass also help prevent light pollution.
| Characteristics | Values |
|---|---|
| Lighting type | LEDs, compact fluorescents (CFLs), and warm-colored bulbs |
| Light fixtures | Dimmers, motion sensors, timers, light shields, and semi-cutoff or full-cutoff wall packs |
| Light direction | Point lights downward or use shields to minimize glare and light trespass |
| Light duration | Use lights only when necessary and for a specific purpose |
| Light intensity | Use lower light intensity or dimmers to reduce overall light pollution |
| Light color | Use warmer color temperatures (CCT) with values less than or equal to 5000K |
| Light blockers | Use tall objects such as room divider panels, trees, shrubs, or tarps to block direct light |
| Filters | Use filters that focus on specific wavelengths of light to increase contrast with the sky |
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What You'll Learn
Use LED lights with warm-coloured bulbs
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.
LED lights are energy-efficient and long-lasting, but they can contribute to light pollution if they emit too much glare. To minimize light pollution, it is recommended to use LED lights with warm-coloured bulbs. Here are some reasons why:
Firstly, warm-toned or filtered LEDs help minimize blue emission, which is a significant contributor to light pollution. Blue light has been shown to impact sleep and can also affect wildlife, with cases of migrating birds losing their course due to bright skies caused by excessive artificial lighting.
Secondly, LEDs with warm-coloured bulbs provide a softer, more ambient light compared to the brighter, cooler-toned LEDs. This helps reduce overall illumination levels, creating a more comfortable and appropriate lighting environment while still maintaining visibility.
Additionally, warm-coloured bulbs can be paired with dimmers, motion sensors, and timers to further reduce average illumination levels and save energy. This not only helps minimize light pollution but also reduces energy costs.
When choosing LED lights with warm-coloured bulbs, it is important to consider the lumen output rather than the wattage. LEDs use fewer watts than traditional incandescent light bulbs, so a lower-wattage LED can still provide the same brightness as an incandescent bulb. Opting for a lower-lumen LED bulb will ensure a softer light that reduces light pollution without compromising on visibility.
By using LED lights with warm-coloured bulbs and combining them with dimmers and other energy-saving measures, individuals can play a role in reducing light pollution in their homes and communities.
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Install light shields and dimmers
Light shields and dimmers are effective tools to combat light pollution. Light pollution is caused by the human-made alteration of outdoor light levels, and it has harmful effects on the environment, wildlife habitats, and our quality of life. Thousands of migrating birds are killed each year due to unnecessary artificial light at night. Light shields and dimmers can help reduce light pollution and minimize its negative impact.
Light shields are accessories that can be attached to the top and/or sides of light fixtures to direct light downward or to a specific area. This minimizes glare and light trespass, preventing light from spilling over into unwanted areas. Light shields are particularly useful in densely populated areas and for outdoor lighting fixtures. By focusing the light downwards, light shields help to reduce sky glow, which is the artificial glow seen over urban areas due to the cumulative effect of lights.
Dimmers are another effective way to reduce light pollution. By lowering the intensity of the light, dimmers allow for using less light overall. This not only helps reduce light pollution but also reduces energy costs. Dimmers can be installed in every room, and some devices also have built-in dimmers or night modes that serve the same purpose.
In addition to light shields and dimmers, motion sensors and timers can also help reduce light pollution and save energy. Motion sensors ensure that lights are only turned on when someone is in the area, while timers control when lights turn on and off, reducing the duration of their use.
By installing light shields and dimmers, and utilizing motion sensors and timers, we can effectively reduce light pollution and minimize its impact on the environment and wildlife. These simple solutions can help restore natural darkness and preserve the beauty of the night sky.
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Turn off lights when not in use
Light pollution is a global issue that affects human health, wildlife behaviour, and our ability to observe stars and other celestial objects. Turning off lights when they are not in use is a simple yet effective way to combat this problem.
Firstly, it is important to understand the impact of light pollution on the environment and human health. Light pollution disrupts wildlife habitats and behaviours, such as migration patterns, and can even lead to the death of thousands of migrating birds. It also affects human sleep patterns and can cause stress, headaches, and low energy.
Secondly, it is essential to develop good habits to reduce light pollution. Turning off lights when leaving a room is a simple habit that can significantly reduce light pollution and energy costs. Using natural darkness as the default at night and only using artificial light for specific purposes is a good practice. This includes using dimmer switches, motion sensors, and timers to reduce illumination levels and save energy.
Additionally, it is important to consider the impact of electronic devices on light pollution. After dark, switching to a dimmer night setting on devices like computers, laptops, and phones can help reduce light pollution and benefit eye health.
Lastly, it is beneficial to advocate for larger-scale changes to reduce light pollution. This includes supporting initiatives like DarkSky International, which advocates for proper outdoor lighting and educates communities about light pollution solutions.
By turning off lights when not in use and adopting other simple habits, individuals can play a crucial role in reducing light pollution and its negative impacts on the environment and human health.
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Point flashlights and headlights downwards
When using flashlights or headlights, always point them towards the ground. Pointing a light source upwards, no matter how small, contributes to light pollution and the artificial sky glow often seen over urban areas. This sky glow spills over into neighbouring areas and can disrupt wildlife.
If you're using a flashlight, it's best to hold it at your side and point it downwards. This will help prevent you from staring directly into the light source and give your eyes time to adjust. You can also set it down and use it like a lamp. This method works well in low-light settings and when you need to keep your hands free.
When using headlights, it's important to be mindful of other drivers. Headlight flashing is often used to communicate with other drivers, such as warning them of road hazards or police presence. However, it can also be illegal in certain places or situations. For example, in Queensland, Australia, headlight flashing to warn drivers of traffic enforcement cameras carries a fine. In South Australia, headlight flashing is illegal except in emergencies or when overtaking.
To avoid contributing to light pollution, be mindful of when and how you use your headlights. Only use them when necessary, and try to point them downwards as much as possible. You can also invest in headlights with a dimmer function or a shield to minimise glare and light trespass.
By pointing flashlights and headlights downwards, you can help reduce light pollution and its impact on the environment and wildlife.
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Use light blockers and dividers
Light blockers and dividers are effective tools to minimise light pollution. They are particularly useful when you want to block out light from a specific source, such as a neighbour's excessive outdoor lighting.
One option is to use a light-blocking fabric, such as the black sun-blocking fabric used for pergolas. You can make a frame using EMT (electrical metallic tubing) and secure the fabric to it, or hang it as a tarp. This setup can be attached to an existing fence or a divider between your yard and your neighbour's. This method provides decent light blocking while still allowing wind to pass through, which is an advantage over using a traditional tarp.
Another option is to use indoor room dividers or tall panels. These can be strategically placed to block out light from streetlights, car headlights, or other light sources. However, they may not be as effective in windy conditions and can be cumbersome to set up. If you're looking for a more permanent solution, you can plant trees or shrubs in key locations in your yard to block out light naturally. This is a long-term strategy, as it will take several years for the plants to grow to an effective height.
In addition to physical barriers, you can also use light shields for outdoor lighting fixtures. These shields help minimise glare and light trespass by directing the light downward to a specific area. This prevents light from spilling over into unwanted areas, such as neighbouring properties. Wall pack light shields, for example, can be attached to the top of the fixture to focus the light downwards. Similarly, back shields can be installed on shoebox or parking lot light fixtures to prevent light from distributing backward. Stadium or sport light shields can also reduce upward light pollution and limit sideways glare.
By using a combination of light blockers, dividers, and shields, you can effectively minimise light pollution and reduce its impact on the environment, wildlife habitats, and your quality of life.
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