The main thing is to not let water set in the crown of a phal. As long as that doesn't happen, you can dunk your orchids in water if you want. Water sitting in the crown will cause it to rot and eventually kill or damage your phal. Sunlight and water on the leaves are also a concern, but as your orchids should not get direct sunlight, that should not matter either. If direct sun shines on a plant with water on its leaves, the leaf will most likely burn.
I hope this answers you question.