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Smart light controls saves energy in Stockholm

With the help of smart lighting control and LED lighting, it is possible both to meet the needs of road users while saving large amounts of energy. This is currently investigated in a large lighting project in Stockholm.

Great potential

In the Stockholm area, there are 50,000 luminaires lighting up the parks and the walking and bicycle paths. With the new technology the energy consumption can be reduced by 4,000,000 kWh, which is equivalent to the CO2-emission of 100 cars driving 20,000 km per year. 

- We are taking yet another step forward to make Stockholm modern and climate smart. The new technology has the potential to reduce the city’s energy consumption by 50 percent. In the long term we want to have this type of energy-efficient lighting throughout the whole city, says Daniel Helldén (MP), city council.

A project in two parts

The project is managed by Sustainable Innovation (Sust) and KTH Light Laboratory in collaboration with the Royal Djurgården Administration, Leading Light, City of Stockholm and Fagerhult and will continue until fall 2015. The project is divided into two diffenrent parts. One can be seen on Djurgården, one of the many islands in Stockholm City, and one in Bromma on the other side of the city.

Our Lunova in BrommaLunova Bromma

In Bromma the city of Stockholms has chosen to use the omniradient post top luminaire Lunova fitted with a radio-based control system from Tritech. 32 pieces has been installed along a walking and bicycle path. 

Read more on Lunova here.

The project is an important part of Stockholm's climate work and also in the work to make the city a more attractive place for residents and visitors", says Anders Hedlund, lighting engineer, City of Stockholm.

Further development of the project on Kungsholmen

The goal for the presence-detected lighting in Bromma is least 50 percent energy savings compared to the old installation. This without compromising on the perceived safety and visual comfort. The project in Bromma builds on a test along Kungsholmen in 2013, where controlled lighting was installed with good results. Read more about the project here.

"One of the goals of the project is that while maintaining good lighting try to save 50 percent of the energy consumption. The quantitative values will be relatively easy to measure. It is the quality that is difficult to capture and translate," says Per- Henry Branzell from KTH Lighting Laboratory. He argues further that it is difficult to find demographic and economic similarities between the areas in Djurgården and Bromma but think that if they find similarities with the results from the study of Kungsholmen beach that will cover a broad spectrum of walking and bicycle paths in our latitudes.

Bromma

On Djurgården presence and daylight-detected lighting from Leading Light has been installed along a previuosly unlit walking and bicycle path. 

Facts

Along a walking and bicycle path way in Bromma, the City has replaced the old post top luminaires with Lunova from Fagerhult and provided them with a radio control system from Tritech. 

Lunova Brommaplan

When no one moves along with the way the lighting is reduced to a low light level. When a person approaches the lighting is automatically up to fhigh light level in groups of seven fixtures at a time (see picture). After a predetermined time the light level is back to low again.