Understanding what I'm getting at, that's proving a problem. I'll try to further clarify for you. By the way, you can address me by my given name if it makes you feel more cozy. I’ve actually posted it a couple of times in recent history. It’s Ben. Aah, I feel less tension between us already.
Knowing about baby box turtle behaviors in the wild. We don't know about average daily routines because they're hard to observe. Just because we're not good at observing baby box turtles with regularity doesn't mean we don't know where they are. No contradiction there. You would have to seemingly suggest (for another disparate example) that we don't know anything about the microhabitat requirements and uses of most plethodontid salamanders, simply because most species spend the better part of their time under cover. We know where they are and why they’re there. But, what do they do there? That’s the largely unanswered part. Still, no contradiction.
Also, microhabitat is an important thing to consider. Most box turtles east of the Great Plains prefer wooded or edge-effect habitats. In both of these settings, cover vs. absence of cover is relative. What seems open to you is a maze of giant grasses, forbs and litter to baby turtles. They see from the ground up, you see from 5 or 6' down. Big difference in perception. I'm still thinking like a reptile. Are you?
Do understand, physiologically, even if we did not know for certain where most baby box turtles spend the bulk of their time (which is indeed in concealment, like most metabolically low-end terrestrial reptiles), we could reason that they cannot spend any significant durations in direct exposure – they are so small and prone to dehydration that they would desiccate rapidly. Remember the Reynold’s number bit about heating. The smaller you are, the less it favors you. We can see from wild baby box turtles (yes, I actually have, albeit statistically limited in numbers) and captive baby box turtles alike that they are less heliothermic (sun-using) and more thermoconformic (subscribe to often-lower microhabitat temps). Adults, being more mobile, larger, and thus less prone to predation and dehydration, are comparatively opposite. Babies grow efficiently at lower temps than the adults can mak efficient use of and this is because the adults have more of a need for augmenting average intermediate temperatures with warming (basking).
I am not insinuating that baby box turtles live underground or that they don’t naturally receive UV rays. The comparisons I made have proved those species which naturally utilize the sun (via their natural behaviors) far more than baby box turtles can do fine without UV bulbs when maintained as captives indoors. I was not citing commercial (large scale) breeders in particular with regards to baby box turtles. Actually, few of those, if any, deal with box turtles for any duration.
Here, there is some use in comparing one detail supported by the achievements of breeders – UV bulbs don’t seem necessary. That detail is useful to disprove the detail you are pushing, that they are necessary. So here, I am not pushing academic investigation, but rather, what breeders have shown. I apologize that I don't give names, but as we all know that many keepers of financially significant species are troubled by potential theft. You’ll just have to either take my word on the proof, or believe that none of all those turtle hatchlings offered on ks are produced by people who do not use UV bulbs. The first way actually sounds more realistic to me.
You said it yourself; you have no true proof in support of your UV bulb favor, past the point that it helps you sleep at night. Having a less positive experience in raising one small group of cohorts is not significant enough to base such a strong recommendation upon.
It seems as though many of the growth and deficiency problems cited by keepers are due to, as I mentioned in a previous post, a misidentification of causative factors and misapplication of multiple parts of captivity, not vitamins or UV bulbs alone.
Also a point of import – UV bulbs do help in the assimilation of VD3. Since most supplements are laced with the same, you would have to do away with such supplements if you wanted to safeguard against D3 overdose in animals maintained under a UV bulb. If you use prepared food that is already fortified, you would have to abort that diet. Is manmade sunlight really that important? So much so as to compromise the nutrition that we do know to be of necessity, to ensure safety for the use of a tool that is not a necessity?
Funny how these long threads often spin off of one remark that is perceived as contradictory by people who have not tried it both ways. You can use UV bulbs. You do use them. You’ve raised babies that way. You have proven that your animals CAN function under UV bulbs. At the same time, myself and others have proven that at least the turtles we raise can and do function without UV bulbs. So we see that the bulbs do not prove necessary. Natural UV rays, again, potentially beneficial. But, they’re not necessary, natural or artificial. We know this because we’ve tried it without them and succeeded without them. Sorry, but it is that basic.