The Milltown and Dargan Wings of the National Gallery have been closed for maintenance.
In a statement, the National Gallery of Ireland said it wished to apologise for the continuing temporary closure of the historic wings of the gallery.
It said an issue arose when a light fitting in one of the galleries detached from the lighting track and dislodged.
Fortunately, there were no adverse consequences for any visitors or staff.
A detailed inspection has taken place and the gallery is awaiting the results and proposals for remedying the issues that have arisen.
The NGI said it will make further comment as soon as there is new and more detailed information to share.
It says it sincerely regrets the inconvenience to its valued visitors but ensuring visitor safety is of paramount importance.
Much of the gallery is still open, and popular works including those by Caravaggio, Vermeer, Jack Butler Yeats and Rembrandt have been moved to galleries that are accessible for visitors.