as far as i know the tropics are known for sativa strains. i dont think they are auto flowering, they just take longer to mature. they are better for an area with that amount of light. i have written this somewhere else that in jamaica (read in hightimes) they are now using some indica strains and they start to flower shortly after planting because of the daylight hours there. so they only reach a few inches of height before they are mature. the daylight/nighttime hours dont change there like they do in either northern or southern hemispheres. it is basicly like 14/10 all of the time.