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they don't.
http://wiki.answers.com/Q/Why_do_plants_grow_bette...
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Sunlight contains all the frequencies of light required by the plant for photosynthesis; where as artificial light sources sometimes do not cover suffiecient parts of the spectrum
http://wiki.answers.com/Q/Why_would_plants_grow_be...
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Depending on your lighting situation outdoors. But in your "artificial lighting" you can control you environment to a set focus that you prefer unlike my plants. I prefer
http://wiki.answers.com/Q/What_is_the_abstract_of_...
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it gives the plant minerals and nutriants but the artificial light gives none of that
http://wiki.answers.com/Q/Why_is_sunlight_better_t...
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