You really do have to experiment with your conditions to see what works. What works for one of use, may not work for you.Originally Posted by Styx
I grow in my house too, and I have found that even between my several south facing windows, there is a difference. So I have modified the plants I grow where etc. I also use some sheer window curtains to "soften" the intensity of the light when needed. That might help with your harsh UV rays issues.
Don't get frustrated -- the tinkering with conditions is just part of growing orchids.