 Originally , the light had a fifth @-@ order Fresnel lens , but a fourth @-@ order Fresnel lens was installed in May 1902 , just three months into its operation . The light characteristic was a fixed white light with a red flash every 15 seconds . In 1972 , the light was automated and the Fresnel lens was replaced with a modern optic . The light continues to serve as an active aid to navigation . In 1987 , a FA @-@ 251 was installed before the current lens , a VRB @-@ 25 was installed . The current light characteristic is an alternating white and red flash every 24 seconds . The white and red flashes can be seen for 18 nautical miles and 15 nautical miles , respectably . 
 Originally , the light had a fifth @-@ order Fresnel lens , but a fourth @-@ order Fresnel lens was installed in May 1902 , just three months into its operation . The light characteristic<a href='been_done' title='1'><mark></mark></a> was a fixed white light with a red flash every 15 seconds . In 1972 , the light was automated and the Fresnel lens was replaced with a modern optic . The light <a href='uninflect' title='2'><mark>continues</mark></a> to serve as an active aid to navigation . In 1987 , a FA @-@ 251 was installed before the current lens , a VRB @-@ 25 was installed . The current light characteristic <a href='drop_aux' title='3'><mark>is</mark></a>an alternating white and red flash every 24 seconds . The white and red flashes can be seen for 18 nautical miles and 15 nautical miles , respectably . 
Originally , the light had a fifth @-@ order Fresnel lens , but a fourth @-@ order Fresnel lens was installed in May 1902 , just three months into its operation . The light characteristic been was a fixed white light with a red flash every 15 secs . In 1972 , da light was automated and the Fresnel lens was replaced with a modern optic . The light continue to serve as an active aid to navigation . In 1987 , a FA @-@ 251 was installed b4 the current lens , a VRB @-@ 25 was installed . The current light characteristic an alternating white and red flash every 24 secsecsThe white and red flashes can b seen fa 18 nautical miles and 15 nautical miles , respectably .