Lights Out was an event on 4 August 2014 in the United Kingdom to commemorate the centenary of the start of

World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...

. It was inspired by the words of

Sir Edward Grey Edward Grey, 1st Viscount Grey of Fallodon (25 April 1862 – 7 September 1933), better known as Sir Edward Grey, was a British statesman and Liberal Party politician who was the main force behind British foreign policy in the era of the Fir ...

, foreign secretary: " The lamps are going out all over Europe; we shall not see them lit again in our lifetime.""Lights Out", from The Royal British Legion
The main event was the voluntary turning off of lights from 10 pm to 11 pm in homes and other buildings across the country. In addition displays or special artwork were organised at a number of high-profile locations.

References

Centenary of the outbreak of World War I First World War centenary 2014 in London {{WWI-stub