Brassavola with red/purple leaves on sun-side

[Roberta]

Remember, the OP is located in the Netherlands, sun angle a lot lower, and sun intensity a lot less, than in southern California. I would have more concern as summer approaches and the sun shifts north (and day length increases a lot) than I would now. Certainly, observation is important - if it feels hot, it is hot. But I think the note by the OP that the plant came from a large greenhouse with uniform light and likely is just adjusting, is a good observation.