I believe it's mostly hollow in there. . .if you look at the bottom of that egg-cup type pot, there is a big hole for extra air circulation and drainage.
So if it's wet on the outside, it's going to be more wet on the inside.
If you wait until it's lightly dry, it shouldn't be totally dried out on the inside.
I just wouldn't want to let it get super crispy on the inside of the cavity.
I bet these can take pretty high light. I've got one that's mounted and it's right up under the lights in my Exo Tank and it's flourishing. . .no sign of it being too much light. I am not using T-5's though. So you'll have to see what you see. . .but I bet 1,500 to 2,500 fc easy.
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