Ummm...you know how I said watch for red? Yeah, you can just go ahead and ignore that. I have two sunburn incidents to report: both YELLOW. One is a one-time-exposure burn, and the second one shows lightening over time.
The small seedling in the photo below was getting too much sun for several weeks. I didn't realize that the baby dendrobiums needed to be in significantly less light than the grownups, until the evidence appeared. You'll see on the seedling, the middle of leaf is starting to turn yellowish and lighten in color, indicating too much sun. Now, this took weeks to happen, so I didn't notice it right away...but it's obviously sunburn because of how it's uneven. Some areas are more yellowish than others.
The bigger plant is a phal that I accidentally left on a sunny table one day. It's a one-day overexposure burn. You'll see the tip of the leaf is burnt, and as you get closer to the middle of the plant, the tissue turns normal color again. Both plants will be fine, but I wanted you to see how different sunburn looks from what's going on with your plant. Your plant is a lighter, uniform green all over. Evidence of sunburn would come in lightening in certain places first. Your whole plant just wouldn't suddenly turn a few shades lighter...you'd notice yellowish patches before it got too bad.
Of course, if I had continued to leave the dendrobium seedlings in the overexposed area, eventually all the leaves would have turned yellow, but I noticed it before it got too bad. And I think you'd notice it if one of your plants was gradually burning, too. I feel really stupid about the phal incident. I was repotting and I moved stuff around and left it on a sunny table too long. Ah well...it will recover. They'll both be fine.
Evidence of me being an idiot:
Ah well...live and learn! If any of my phals turn red the mythical "red" color I hear people talking about, I'll let you know! LOL
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