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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.
Most plants need a minimum of 12 hours of light each day. The light can be all artificial or you can use artificial lights to supplement the natural light. Naturally the closer your lights are to the source, the more light they will absorb. Your high maintenance plants may require up to 16 hours of light each day.