Window shade for orchids

[EDDIE]

everyone,

Not sure if this is the proper category to post this thread in, but here goes: I have several cattleyas that are in a south window, one that has successfully bloomed there, however, I believe they are getting sunburn and was wondoring what I could put over the window to filter the light? Some of the leaves are turning red, my brassavola blooms there, but it also gets red leaves. Thought about doing cheesecloth, but not quite sure...any suggestions would be appreciated. Thanks...

Eddie