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The lights which are turned on in a bar or nightclub at or shortly before closing time so as the staff can see to clean up and to give the patrons the signal to leave. These can be either a specific set of lights or simply the general lighting in the building.
"How was your night?"
"Not bad - we stayed at the pub until the sobriety lights came up and we had to head out."
by Das Frettchen December 12, 2012