hi just to answer your question i posted two images so you would know exactly how much light my vandas are getting .first of this is my lanai patio ,and if you noticed on that second picture is the very corner thats where the sun rises so maybe I would say south east maybe? and they do received filtered light because it is a screen enclosure and they received light from 8am until 11-1200 noon depending on the time of the year the latest and most is probably 1300 in the afternoon.hope this answers your questions.
pls dont think that i wont answer your question ,the only reason that I cant answer your question is when i dont have that time at that very moment but surely i will find ways to answer your questions but other than that i dont see any reason why I cant anwer, though im not a vanda expert all i know and how i grow my vandas (though as i have said im a lazy grower or a simple grower ) will be shared ..i believe in sharing because if you do share, everyone will have a smile on their faces when they see their vanda grow and bloom ha ha ha later man.