Logroño moves towards a responsible lighting model with 2200 K LED technology

LOGROÑO —9/5/2025— The City Council of Logroño has taken a significant step in modernising its public lighting system with the renovation of luminaires in the heart of its historic district. The project, carried out with ultra-warm 2200 K low-power LED luminaires, improves energy efficiency and blends seamlessly into the city’s heritage environment, while also reinforcing the municipality’s commitment to sustainability and the reduction of light pollution.

The initiative gains special relevance in 2025, as Logroño hosts the 51st National Lighting Symposium, organised by the Spanish Lighting Committee. The event will bring together experts from across the country to discuss the future of public lighting in the context of artificial intelligence, energy efficiency, and environmental quality.

Technical lighting in the city’s most iconic area

The project involved replacing 872 luminaires throughout Logroño’s old town, including iconic locations such as Calle Portales and Plaza del Espolón, cultural and historical landmarks of the city. Over 90% of the lighting points installed are Siglo XLA models —fernandine-style luminaires fitted with Comfort Diffuser® and configured at 2200 K— specifically chosen to preserve the area’s traditional character while delivering high technical performance.

The new luminaires operate at very low wattages, ranging from 19 to 35 watts, calculated specifically for each location through a tailored and refined lighting design. This detailed planning has made it possible to achieve high uniformity (up to 0.8) with minimal light levels, delivering optimal visibility and a more balanced nighttime atmosphere, free from harshness and excessive brightness.

According to Julio César García García, Head of Electrical Maintenance and Installations at the Logroño City Council, the results fully meet the project’s original objectives. He notes that the uniformity achieved is excellent, even at very low light levels, and sees this balance as key to improving both energy efficiency and visual comfort, while minimising environmental impact.

High uniformity with low levels: efficient lighting without overillumination

A substantial portion of light pollution comes from reflected light on the ground, which can account for up to 30% of the emitted output and, if left unchecked, ends up dispersing into the atmosphere. For this reason, the project’s primary goal was not to increase light levels, but to ensure a uniform distribution of light using the lowest possible power.

This was made possible through customised optics and technologically advanced luminaires, capable of delivering effective distribution without oversizing the system. The result is an optimised installation that improves energy performance and eliminates unnecessary consumption, achieving energy savings of more than 70% compared to previous discharge technologies.

A 2200 K spectrum designed to protect the night sky

Beyond distribution performance, ATP’s 2200 K luminaires stand out for their exceptionally low blue content in the spectral radiance, a key factor in protecting the night sky and preserving natural rhythms.

With only 1.28% of radiant flux below 440 nm, this technology reduces disruption to the circadian rhythms of people and local species, and limits light dispersion into the atmosphere—unlike other LED solutions, which can emit up to 45% more blue light. This specificity makes the system an ideal choice for sensitive urban environments or areas near natural habitats.

Complementary solutions for diverse lighting needs

In areas that required a more neutral light tone or broader beam spread, the project incorporated Globo S luminaires with Comfort Diffuser® and Aire® 3 Series and 5 Series floodlights, configured at 3000 K. These units were used in more open spaces or high-traffic zones, ensuring suitable illumination while maintaining overall aesthetic coherence.

Custom manufacturing and full control over results

The entire installation was custom-manufactured, luminaire by luminaire. This approach allowed each unit to be precisely adapted to its location in terms of both power and photometric distribution, avoiding overillumination and maximising system efficiency.

Guillermo Redrado, vice president of ATP Lighting, highlights the importance of project customisation: «When projects are well-designed and luminaires are custom-built, it’s possible to illuminate with precision, avoiding energy waste and minimising impact. This project shows that the future of public lighting lies in tailored, efficient solutions fully integrated into the urban landscape.»

A national benchmark in the year of the Symposium

With this initiative, Logroño consolidates a modern and responsible vision for public lighting, where energy efficiency, environmental care, and visual quality go hand in hand. In the same year that it hosts the country’s most important lighting event, the city positions itself as a benchmark in the effective application of technology to enhance both urban heritage and natural surroundings.