It emitted an oil-fuelled, fixed white light over 342 degrees, with a fifth-order lens giving a nominal range of 11.5 nautical miles.

A 500-watt bulb was installed, emitting a green flash for 0.3 seconds followed by a one-second concealment, with a range of 17 nautical miles.

In 1978 it was decided to close the lighthouse, both because it no longer served a useful purpose for navigation and because it was in the way of construction work for the new terminal for passenger ferries connecting Cacilhas with Lisbon.

It was dismantled and, in 1980, was sent to the Azores to replace the Serreta lighthouse on Terceira Island, which had been damaged by an earthquake on 1 January 1980.

[3] At the request of the Municipality of Almada, the Directorate of Lighthouses agreed to the return of the structure to Cacilhas in 2000.