I wonder if it's actually metabolic bone disease that the flyers are prone to? Gliders are very prone to that, as are reptiles if they don't have enough UVB light. They need very specific amounts of calcium, vitamin D, and phosphorus in order to properly metabolize the calcium. It sounds very similar.
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I did not know that gliders were prone to that too. But yeah, pretty much what they require.
And since they tend to be a bit heavier than gliders, better to anchor your lamps as those are what they tend to like landing on.