The light was taken out of service in 1889 and the building has served as a museum for the Stonington Historical Society since 1925.

The light was originally lit by an oil lamp and broadcast by eight parabolic reflectors.

This technology was already obsolete at the time of the lighthouse's construction, and it was replaced by a sixth-order Fresnel lens in 1856.

The site is now the home of the Stonington Historical Society which uses the building as The Old Lighthouse Museum.

Holdings in the museum document the area's long and distinguished cultural and nautical history, and exhibits include the 1856 Fresnel lens.