user: Question: Focal plane in ft (m) is 43ft (13.1m) is the first date lit.
Columns: ['Lighthouse', 'Location', 'Province/City', 'Date First Lit', 'Tower height in ft (m)', 'Focal plane in ft (m)', 'Current Status', 'Current Condition/ Description']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Apo Reef (1)', 'Sablayan', 'Occidental Mindoro', '1906', '118ft (36.0m)', '134ft (40.8m)', 'Nonextant', 'Replaced with a new modern white tower.']
SQL:

assistant: SELECT "Date First Lit" FROM "Table" WHERE "Focal plane in ft (m)" = '43ft (13.1m)';