What effect did blackouts have in World War 2?

During World War II, blackouts were implemented in many countries to minimize the risk of enemy air raids. By reducing light exposure at night, cities became less visible to bombers, helping to protect civilian populations and critical infrastructure. These measures also fostered a sense of solidarity and resilience among citizens, as they adapted to the challenges of wartime conditions. However, blackouts could also lead to accidents and hinder emergency response efforts due to reduced visibility.