The British built their first lighthouse in Trincomalee in the year 1845 on the flagstaff post of the old Trincomalee Fort (Fort Frederick). The lighthouse had one single light with 2 reflectors with an elliptical focus of 6 ½ inches. The lantern was 206 feet (52.8 meters) above the sea level and 10 feet (3 meters) from the foot of the lighthouse. The light was powered using coconut oil.