I had to do the conversion, but 16c (60f) sounds like what you would hope to get the temps near or below during the warm season. I would think that the 50'sf would be better, and if it can handle closer to freezing (as it seems to since all the flowers) then all the better. I would want to have any cool habitat masdevallia types in the 50's regularly, or at least low 60's. When I was sold some masdevallias and a few draculas, they were okay in my apartment in the winter when it was in the low to mid 60'sf all the time, but when we had a summer heat wave, they kicked the bucket (was in the high 70's and sometimes higher overnight)