On 26 Oct 2018 Sri Lanka issued a set of four very nice stamps featuring lighthouses of Sri Lanka. The stamps are available individually or as mini sheets.
Barberyn Lighthouse is also known as Beruwala L/H and is located on a small island on the southwest coast of Sri Lanka.
Galbokka Point Lighthouse is located south of Colombo harbor on the point for which it is named.
Point Pedro Lighthouse is located on the north end of Sri Lanka at the southeast entrance to Palk Strait between India and Sri Lanka.
Oluvil Lighthouse is located on the southeast coast of Sri Lanka near the fishing port of the same name.
More lighthouse stamps from Sri Lanka can be seen here