The war was a dark time in a double sense. Black-out curtains made sure that cities and other strategically interesting bomb targets were kept dark. Black-out curtains were mandatory and those who didn’t follow order were fined, they could risk having their electricity cut and in some cases even harder sanctions came into question.
The purpose of the black-out was to make it difficult for airplanes to orientate, so that bomb targets, houses and the population were protected. The responsibility for black-out regulations and follow-ups was under The Office for Civil Air Defense in the Department of Justice. In this archive you will find numerous issues and correspondence related to black-out: regulations and the processes leading up to these, analysis, an overview over time for black-outs in the different towns and densely populated areas, various orders from German authorities, reports from controls, and applications for exemption from the regulations. The dark streets were unsafe to roam. Not only buildings had to prevent light, cars had to have special black-out shields over the lights. In the above mentioned archive you can also see drawings of different alternatives for black-out.
The blackout regulations were enforced by the local police stations. You will find issues regarding black-out in several district police archives, journals and reports from black-out controls. You will also find something about black-out in the different local civil defense districts.