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Left Field - 315 feet (96 m)
Left-Center - 362 feet (110 m)
Left-Center (deep) - 404 feet (123 m)
Center Field - 436 feet (133 m)
Right-Center - 373 feet (114 m)
Right Field - 326 feet (99 m)
Lopez hits almost all of his home runs to straight away left field, 315 feet is pretty friendly and that would probably help Lopez hit 30 home runs a year in Houston which would go a long way towards appeasing the fans in Houston.
there was a good article on his power at USSMarinerhttp://ussmariner.com/2009/08/20/lopezs-power/