In 2013 France enforced an order to limit light pollution and night energy consumption. The main aspects of the  law are:

  • Interior lighting in office buildings must be switched off one hour after the staff leaves the building
  • Exterior lighting used for illuminating building facades may be turned on one hour before sunset but must be switched off by 1 a.m.
  • Window lighting in commercial buildings must be switched off between 1 a.m. and 7 a.m.