I've seen this quite a bit with my cattleyas by now. Not all hybrids, like the cattleya free spirit is completely green no matter what but my potinara burana beauty is the darkest purple, it's almost black.
It's not all down to light, it really depends on the variety and strangely enough I have also seen orchid adapt to high light which really took me by surprise. Basically I stuck a vanda in a spot that turned it's leaves darker and initially I was playing a game of move the vanda whenever the leaves got too dark but I knew the light was fine for all my other vanda's so I decided to just leave it and see how badly it got burnt... A few months went by. It started growing like crazy and the new leaves... completely green.
To me I'd say it eventually adapted to a higher light condition and is now growing faster as a result but it took me probably a year before I decided to just ignore the dark leaves.
Anyway to cut a long story short, to me this one look like its getting the perfect light level. Less light will just result in the plant receiving less energy. You don't want to give any more either but this level is perfect so unless a prolonged heatwave is on the way I wouldn't change anything.
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