It may be possible to grow Caladiums in direct, intense sun but I think they would need adequate daily water to keep the soil and roots consistently moist.
@Caladiums4Less - Bill, are you around? I'd love to know the answer to this question as well. Here in Florida I grow Caladiums in morning sun because I find the mid day and intense afternoon sun tends to wash them out and totally fry them.
I googled and found this article of interest from LSU:
http://www.lsuagcenter.com/en/...