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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.
According to NSTAR, 29% of energy use in non-residential buildings is used for lighting. If you turn off the lights whenever you leave a room, you can reduce greenhouse gas emissions by 0.15 pounds per hour.