I'm not too sure about the possibility of shell pyramiding being a danger to box turtles. I've never seen it in my 40 years of husbandry, and suspect their typical carnivorous, high-protein diet for their first year or two of life would seem to prove the fears unwarranted. Tortoises are much more prone to this malady than box turtles.

Also, I don't think the UVB is critical to healthy shell development in box turtles since they seem to spend so much time "hidden" when young. I do think I've read that the UV rays have been shown to be visible to turtles, providing a more "natural" light source, and perhaps helping to stimulate a normal feeding response, so it seems they would be helpful in this situation. I use the UV bulbs on my hatchlings.

I'm just spouting from my experience, your mileage may vary...

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