Øresundsbro Konsortiet, the owner and the operator of the Øresund Bridge upgrades the tunnel lighting. For those who have not heard of the Øresund Bridge; it is a 16-kilometre fixed link between Denmark and Sweden consisting of a bridge, a tunnel and the man-made island of Peberholm. Following released on released on 23 November in Danish. Any translation mistakes are mine!

New LED fluorescent lamps in the Øresund Bridge tunnel provide major cost and energy savings

From 70,000 to 100,000 hours of burning time becomes a reality when more than 4,500 fluorescent lamps are replaced with LED fluorescent lamps in the Øresund Bridge tunnel. Eight nights and four minutes per. luminaire is set aside to carry out the major replacement.

- The replacement of the fluorescent tubes will give us a more energy efficient LED lighting on the whole connection. We expect energy consumption to be reduced by approximately 50 percent compared to the old fluorescent tubes, says construction director Bengt Hergart.

For more than ten years, Øresundsbro Konsortiet has worked purposefully to reduce energy consumption, for example through extensive replacements in road lighting and pylon lighting. Now it's time to modernize the tunnel lighting using LED fluorescent lamps, without having to replace the 20-year-old luminaires.

The luminaires in the Øresund tunnel were installed when the connection was completed in 1999-2000. The luminaires are still well-preserved and can therefore remain seated, but will in future be lit with LED fluorescent lamps, which are expected to provide an energy saving of 9.6 GWh during the eleven-year estimated lifetime. This corresponds to a consumption on the entire connection of 1.5 years or 50 villa heat pump consumption for 11 years.

- In addition to a large energy and cost saving, it is also a circular and sustainable project not to have to scrap the luminaires and buy new ones, as they are still in good condition. Our supplier has presented a smart way to adapt the luminaires to modern lighting, says Bengt Hergart.

Since 2009, only every sixth fluorescent lamp in the tunnel is lit at night, and three years later, every second fluorescent lamp was switched off during the day. And so it will be in the future to maintain low energy consumption.

- In the first years, the tunnel had an unnecessarily strong lighting, so there are good opportunities to limit the lighting without compromising safety, says Bengt Hergart.

The replacement will take place over eight nights Monday to Thursday at 20.00-05.30 in weeks 48 and 49. First, the fluorescent tubes in the northern tunnel tube will be replaced in the direction of Denmark and the following week in the direction of Sweden.

Once the lighting is replaced, each lamp is expected to burn for 100.00 hours, which is 30,000 more than the fluorescent tubes that were installed in 2013 and at the time also contributed to a significant energy saving.

- We reckon that we will not have to replace the lighting again until eleven years from now, which makes this another sustainable investment on the connection from several perspectives, says Bengt Hergart.

Facts: The tunnel lighting

• In connection with the completion of the Øresund connection, approximately 8,500 luminaires were installed in the 3.5-kilometer-long tunnel. Since 2009, only every sixth lamp is switched on at night to reduce energy consumption without compromising safety.
• When replacing, the fluorescent tubes in each other luminaire are replaced, but in some places in the tunnel there are luminaires in double rows. In total, there are approximately 4,500 luminaires.
• The fluorescent lamps in the tunnel must light efficiently at night and not dazzle during the day. They must give an even light and they must not flash or flicker because it may disturb passers-by.
• The new LED fluorescent lamps have a burning time of 100,000 hours. Current fluorescent lamps have a burning time of 70,000 hours.
• The tunnel lighting project is estimated to cost almost DKK 5 million. DKK. The Øresund Bridge has a maintenance and investment budget that covers the costs.
• Each replacement of the fluorescent tubes is estimated to take four minutes. A total of 12 electricians will be working on the replacement. Each luminaire must be opened and adapted to the LED fluorescent lamps, the fluorescent lamp must be mounted, the glass must be cleaned and mounted.
• The lighting technology company TopRight Nordic, together with the installation partner Kemp & Lauritzen A / S, won the tender for a more energy efficient