Sustainable lighting

Lighting Plan 4.0 forms part of a sustainable development approach. As well as energy savings, the materials chosen throughout the modernisation phase were also assessed in terms of their durability, longevity andwhether they could be recycled. Furthermore, ways in which to reduce light pollution and the conservation of Natura 2000 areas have been the focus of much thought while modernising the equipment.





Energy savings

By replacing sodium lighting with LEDs it is clearly possible to save energy; coupled with a light dimming strategy, however, savings of 76% can be made.


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Conservation of flora and fauna 

Being aware of how sensitive to light flora and fauna can be, Lighting Plan 4.0 carried out an evaluation of various incidents in partnership with the Ecology Department at the University of Liège. On the basis of this study, the following actions were implemented.

  • Use of warmer colour temperatures in Natura 2000 areas
  • Use of ULOR 0 lights – in other words, no lighting is visible above the horizontal plane.
  • Lowering of the mast height at ecoduct level
  • Lower light intensity or even the option to switch off the lighting between April and October (during the breeding season) in the most sensitive Natura 2000 areas

By employing these measures, it is possible to best respect the nocturnal cycles of flora and fauna, including any specific behaviour they may exhibit in relation to light.

Connected lighting, CO2 avoided

Over the 20 years of the contract period, 166,000 tonnes of CO2 emissions will be avoided, which is the equivalent of around 100,000 Paris–New York flights.