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All habitable rooms (i.e. rooms for living, sleeping, eating or cooking) shall be provided with natural light by means of exterior glazed openings with an area not less than 1/10 of the floor area of such rooms with a minimum of 10 square feet.
For example: If your room is 17 feet wide and 20 feet long, the total area is 340 square feet. Multiply 340 by 1.5, and you'll get 510, so you'll need 510 watts of total light to efficiently light your room.