Thanks to Ivan Shishkov for the following information about the recent release (20 Jul 2018) by Bulgarian Posts of a souvenir sheet showing Burgas Lighthouse located at the north side of the entrance of the port of the same name in Bulgaria. The lighthouse is shown on the lower right portion of the sheet but not on the stamp. The sheet was issued on two types of papers, one ordinary and the other on paper with UV fibers. The UV version has serial numbers from 00001 to 001800 while the ordinary paper ones are numbered from 001801 to 003600.
Burgas L/H | Sc ?, Mi BL455, SG ?, Yt ? | 20 Jul 2018
See more lighthouse stamps from Bulgaria here
On 22 June 2017 Bulgaria Post issued this souvenir sheet of four lighthouse stamps.
Ahtopol L/H | Sc 4813, Mi 5320, SG 5051, Yt 4489, WADP BG023.17 | 22 Jun 2017
Cape Shabla L/H | Sc 4814, Mi 5321, SG 5052, Yt 4490, WADP BG024.17 | 22 Jun 2017
Burgas L/H | Sc 4815, Mi 5322, SG 5053, Yt 4491, WADP BG025.17 | 22 Jun 2017
Cape Galata L/H | Sc 4816, Mi 5323, SG 5054, Yt 4492, WADP BG025.17 | 22 Jun 2017
Bulgarian Lighthouses | Sc 4816a, Mi BL435, SG MS5055, Yt BF366, WADP BG025MS.17 | 22 Jun 2017
More Bulgarian lighthouse stamps can be seen here