well as king stated with terrestrials you do have some that are sensitive to light in fact a few hardy cyps will suffer greatly from even a minute or two of exposuer to light sometimes even to the point of being killed outright.....
But as far as I know they are the exception not the normal response.
Most epiphytical ones are not going to have a problem and in fact as king said may even photosenthize and in fact some go so far as to have no leaves and the roots do all the work.The ghost orchids for example.
I have noticed that my Catts seem to put roots out to the area of the pot where the light gets to them faster than they do towards the center of the medium where it is basicly dark.
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