2026-07-27
Written by Julian Lee
The increasing use of LED lighting is often touted as a solution for energy efficiency and environmental sustainability; however, its widespread adoption may have unforeseen consequences on our natural world. In reality, the sheer scale of global LED installations could lead to an unprecedented amount of light pollution that threatens our planet's starry skies.
As I stand in the heart of London's Trafalgar Square, surrounded by iconic landmarks like the National Gallery and St. Martin-in-the-Fields, I am reminded of the complex relationship between lighting and darkness that exists in almost every city, suburb, small town, and village around the world. The square's history, which dates back to the 13th century, is a testament to the evolving use of artificial light in urban spaces.
The current state of nighttime illumination is one of excess, with unshielded illumination blasting in all directions, creating shadows, impeding our vision, and giving the illusion of safety without the reality. This phenomenon, known as light pollution, has far-reaching consequences for human health and the environment. Research has shown that increased exposure to blue light from LEDs can disrupt circadian rhythms, contribute to sleep disorders, and even increase the risk of obesity, certain cancers, and type 2 diabetes.
However, LED technology offers a promising solution to these problems. By using semiconductors to convert electricity into light, LEDs use up to 90 percent less energy than incandescent bulbs, which has enabled municipalities to realize an immediate energy savings of 50 percent or more. This fact alone has fueled the technology's widespread adoption.
But despite the benefits of LED technology, our nights are often still lit with harsh and clinical light, casting glare and creating shadows that disrupt human and ecological health. The answer starts with the color of LEDs. Most manufacturers coat a blue semiconductor core with a yellow phosphor material to produce a "white" light, which is heavily blue. This color is exactly the one no species has evolved to expect at night.
The problem is compounded by the widespread use of LED streetlights that are not designed to be warm-colored or tuned to specific lighting levels. As a result, cities like Paris and London struggle with the harsh glare from their new LED streetlights, which starkly contrast with the warm golden light of old sodium-vapor lamps.
But there is hope. In 2019, France introduced a nationwide law to reduce levels of light pollution, setting rules about both public lighting and private lighting. The country has also implemented measures to minimize artificial light in ecological corridors designed to protect nocturnal species like birds, bats, and insects. These corridors are connected and dark, mitigating the disruption to the 30 percent of vertebrates and more than 60 percent of invertebrates that are nocturnal.
In Paris, the city is experimenting with LED lighting systems that can be programmed to rise and fall in brightness depending on the time of night or year. The goal is to create a softer, warmer glow that reduces glare and creates a more inviting atmosphere at night. This approach has been successful in some European cities, where digital controls for interior lighting have become commonplace.
The potential for LED technology is vast, but it requires new thinking about light and darkness, safety and security. As Simon Thorp, a local lighting designer, notes, "We should aspire to have cities that see the stars." This vision is possible with the right design and planning, which would not only reduce energy and maintenance costs but also bring benefits like healthier nights for humans, safer skies for nocturnal creatures, and a restoration of the stars.
The tale of London and Paris in 2026 will be one of a brilliant technology that we've engineered but haven't yet learned to master. We have yet to change the way we think about artificial light at night and use it more thoughtfully and carefully, as we might. But with the right approach, our cities can become havens for both human health and ecological well-being, shining bright with a warm and inviting glow that illuminates our path forward.
As I walk along the Seine River in Paris, I am struck by the city's beautiful uniformity and attention to detail. The iconic Eiffel Tower stands tall, its metalwork illuminated with a warm amber light from high-pressure sodium bulbs. This approach has been successful in creating a unique and inviting nocturnal atmosphere that is both romantic and memorable.
However, this approach requires careful planning and design, which is often lacking in modern urban spaces. As I make my way through the city's streets, I am struck by the contrast between old and new lighting systems. The warm golden light of old sodium-vapor lamps is a rare sight, as most streetlights have been replaced with bright white LEDs.
The Illuminated River project, which features nine bridges along the Thames, is a notable exception to this trend. By using LED lighting schemes that move and change color and intensity, the project has created a coordinated work of art that transforms the city's nocturnal atmosphere.
But even in Paris, where the focus on light pollution is well underway, there are still areas that need improvement. The bright white LEDs lining the streets of many neighborhoods still cast harsh glare, disrupting human health and ecological well-being.
The key to creating a more inviting nocturnal atmosphere lies in finding the right balance between lighting levels, color temperatures, and design. This approach requires new thinking about light and darkness, safety and security, which is exactly what LED technology can provide.
As I reflect on my journey through London and Paris, I am struck by the potential of LED technology to transform our urban spaces. From energy efficiency and cost savings to improved human health and ecological well-being, the benefits are clear.
But this vision requires new thinking about light and darkness, safety and security. As Simon Thorp notes, "We should aspire to have cities that see the stars." This approach is possible with the right design and planning, which would not only reduce energy and maintenance costs but also bring benefits like healthier nights for humans, safer skies for nocturnal creatures, and a restoration of the stars.
The City of Light's future will be shaped by our ability to harness the power of LED technology in ways that are both sustainable and beautiful. As we look to the future, let us strive to create cities that shine bright with a warm and inviting glow, illuminating our path forward towards a brighter, healthier, and more sustainable tomorrow.
As I stand in Trafalgar Square, surrounded by iconic landmarks and the gentle hum of LED lights, I am reminded of the complex relationship between lighting and darkness that exists in almost every city. The current state of nighttime illumination is one of excess, with unshielded illumination blasting in all directions, creating shadows, impeding our vision, and giving the illusion of safety without the reality.
But LED technology offers a promising solution to these problems. By using semiconductors to convert electricity into light, LEDs use up to 90 percent less energy than incandescent bulbs, which has enabled municipalities to realize an immediate energy savings of 50 percent or more.
As we move forward in our journey towards a brighter, healthier, and more sustainable future, let us strive to create cities that see the stars. This vision is possible with the right design and planning, which would not only reduce energy and maintenance costs but also bring benefits like healthier nights for humans, safer skies for nocturnal creatures, and a restoration of the stars.
The potential for LED technology is vast, but it requires new thinking about light and darkness, safety and security. As Simon Thorp notes, "We should aspire to have cities that see the stars." This approach is possible with the right design and planning, which would not only reduce energy and maintenance costs but also bring benefits like healthier nights for humans, safer skies for nocturnal creatures, and a restoration of the stars.
Let us strive to create cities that shine bright with a warm and inviting glow, illuminating our path forward towards a brighter, healthier, and more sustainable tomorrow.
