Isochilus linearis - leaves turning red

[theroc1217]

At first I thought it was just the old canes maturing and dying off as the new ones come in, but it seems that they're just turning a deep red. I know some cat's do this, but I'm worried that this deep red will turn out to be sunburn.

I don't have them outside, but they are really close to three T5 lights.

[isurus79]

Sun burn on orchids is always brown or black and never red. Many orchids do this when being grown in good light so I wouldn't worry about it.