Kıyı Emniyeti Genel Müdürlüğü

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Intro	:	YEŞİLKÖY LIGHTHOUSE
Lighthouse Name	:	The first lighthouse that the vessels, which are to be enter to the Istanbul Strait safely from Marmara Sea, see in order to determine their courses is Yeşilköy Lighthouse. The first name of this lighthouse which was built on the Yeşilköy burnu in 1856 by Ottoman Empire as a stone tower was Ayastafonas Lighthouse and has been changed as a Yeşilköy Lighthouse in accordance with the district. It is 23 meters height above the sea level and tower of the lighthouse is 16 meters of height. The visual sight distance of the lighthouse, in which has the flashing character of Fl.W.(2) 10 sec, is 15 nautical miles. Oil lamp has primarily been used and then high intense filament lamps work with LPCo as a light source and it is currently provided an illumination with the electric lamp of 500 W. In order to be seen from the long distance by strengthen the light source, cotodiyoptric cylinder lenses which has optical distance of 500 mm as a optic system has been used. At the date of establishment flashing there by blacking and clearing to the light source by dark screens rounding around the optic operated with electric acetylene flash afterwards and it has still been operating with electrical flash. It has still been operating with electrical flash. Lighthouse and guardian house is under protection as national heritage by General Directorate of Coastal Safety and Salvage Administrations.