From the U.S. Coast Guard Lightship site.
The Arctic was built 1853-1855 for $10,000. It was wood frame and planked and fitted to lightship use in 1859.
The ship was 98 feet long and had a beam of 23.6 feet. Draft was 11.6 feet and 232 tons. Propulsion was steam, but machinery removed by the U.S. Navy prior to sale to U.S. Light House Service. It was converted to schooner rigging when modified.
Illumination apparatus consisted of a single lantern on the mainmast which had eight lard oil lamps with reflectors.