Single bright lights will be displayed in each corner of the Hertsmere Council offices to commemorate the centenary of the start of World War One.
The council is taking part in Lights Out on August 4 - a UK-wide event that invites everyone to turn off their lights between 10pm and 11pm, with participants leaving on a single light or candle.
It marks the exact time that Britain entered the World War One at 11pm on August 4, 1914.
The council will be supporting this national project by shining a single bright light from each corner of the top floor of the civic offices building in Elstree Way, Borehamwood.
Leader of the council, Councillor Morris Bright, said: "The Lights Out initiative provides the public across the UK with an opportunity to reflect on one of the darkest periods in history and remember all those who gave their lives during the First World War.
"I'm very proud that we are taking part in this event and I hope that Hertsmere residents will take the opportunity to also participate in what should be a very fitting tribute."
Earlier in the day on August 4, the Mayor of Hertsmere, Councillor Carey Keates, will be attending the opening of a World war One 100th anniversary exhibition at Bushey Academy, organised by Bushey Museum and Art Gallery.
The Deputy Mayor is attending a special screening at the Rex Cinema, Berkhamsted of a DVD produced by the Lieutenancy to commemorate the outbreak of the war entitled A County At War, Life On The Home Front In Hertfordshire.
Potters Bar Museum at the Wyllyotts Centre currently has an exhibition showing, with a separate exhibition at Elstree & Borehamwood Museum at 96 Shenley Road planned for October.