I have a couple of mounted ones that I haven't been watering often enough. They have the same look as yours. Someone else posed the same question about a month ago, and I was going to respond to it and couldn't find the thread.
I think it's lack of humidity and first signs of underwatering... at least in my case. And I've seen same before in phals of mine with low humidity and some benign neglect on watering that were potted in bark, not mounted. I always see it as a shoutout to get a bit less lax on my part.
Perhaps with your new lighting they're drying out faster?
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