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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.
This will give you the total number of recessed fixtures you'll need in that space. For example: If your room needs 510 watts of total light, and you want to use 60-watt bulbs (the average wattage of a can lightbulb), eight or nine bulbs should sufficiently light the space.