I have most all my house plants at a large south facing window. Spring and summer no direct sunlight thru the window. I'm 45* N lat and I'm starting to get mid day sun (2-4hrs) thru the window. The Sans and Spiders seem to love it but I'm not sure about the Hoya's. It's not blazing sun as I have a tree that breaks up the light. Should I be concerned?
ETA: It's cloudy and near overcast much of the time here in NW Orygun, so it's not sun every day.