CREATE TABLE table_27824 ("Lighthouse" CLOB, "Location" CLOB, "Province/City" CLOB, "Date First Lit" CLOB, "Tower height in ft  ( m ) " CLOB, "Focal plane in ft  ( m ) " CLOB, "Current Status" CLOB, "Current Condition/ Description" CLOB)

Focal plane in ft (m) is 43ft (13.1m) is the first date lit.
SELECT "Date First Lit" FROM table_27824 WHERE "Focal plane in ft (m)" = '43ft (13.1m)'
SELECT "Date First Lit" FROM "table_27824" WHERE "Focal plane in ft (m)" = '43ft (13.1m)'