My 'Sun Power' was moved last year from a dark corner where it was languishing to a full-sun location (we had to remove a tree) where another hosta had totally fried early in the season.
At first it like the additional sun and was looking good, but by the end of the season, it was looking pretty sad. I've seen well-respected gardeners who write columns for the media promote this one as one that can take full sun but they really should know better. It cannot and I've proven it.
May 16 in its original location
July 3 it was looking great
By Aug. 2, it was beginning to get crispy around the edges
Aug 31 - very crispy indeed