For phals, I usually see them in the greenhouses growing in shaded light. Not nearly as bright as say catts and even cyms. Usually a heavier white painted plastic or I've seen them growing in a shade cloth house. The purple is most likely the species. My white phals never get any purple on them and I have mine in a brighter light than I would have them if I had more room. Pacific Orchids in Leucadia has them in the most shaded part of their growing house and they bloom very nicely. Remember that the more light you give above the normal requirements the more air movement you have to give to cool the surface of the leaf.
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