When It's Lamp Lighting Time in the Valley is a 1933 country ballad to a waltz melody with words and music by Joe Lyons, Sam C. Hart and The Vagabonds, Curt Poulton, Herald Goodman, and Dean Upson.
In 1936, Larry Vincent and Harry Pease released a song with the same melody titled "When the Sun Says Goodnight to the Mountain".
The opening words of the first verse, "Var gång skymningen stilla sig sänker" ("Every time when the dusk slowly falls") often refers to December as the darkest month of the year on the Northern Hemisphere.
The song has also got lyrics in Norwegian, as "Når lysene tennes der hjemme" (meaning the same as in Swedish) and Finnish, as "Kodin kynttilät" (Candles of the Home).
The song became immensely popular in Finland during the Winter War, as the Finnish lyrics can be interpreted as a soldier's longing to home and his loved ones.