From the beginning of the war, the English Air Force carried out attacks on targets in occupied territory and in Germany itself. Ports and factories suffered damage. To make sure that the English pilots would be unable to find their way at night, the Germans ordered the whole of the Netherlands to be darkened between sunset and sunrise. Windows had to be painted black or sealed off with black paper. The street lights had to be switched off as well.
The Netherlands in the dark
1940 - 1945 Amsterdam
The municipality of Amsterdam placed special lights by the sides of the roads so that traffic was hindered as little as possible. Curbs, railings, and the edges of the quays along the canals were painted white to make them better visible in the dark. House numbers were painted on with large, white numerals.