that much of the information on both sides is largely observational, uncontrolled and often biased to begin with. Not necessarily the epitimy of scientific method...
This article I found is a good example. It's just like Pacmans study only with 8 beardies instead of one...
"Question: Does UVB make a difference in bearded dragon growth and development or is regular supplements with Calcium with D3 and other good husbandry enough for their ability to thrive.
We received 8 dragons in at the beginning of July as non thrivers. Four of them (Group 1) came from a very knowledgeable breeder, who gave excellent supplements, and what we thought might be inadequate UVB. (tubes) The other 4 (Group 2) came from somebody I knew who'd raise them since hatchlings, again with good supplementation and no UVB as they had been told by the prior breeder that it was not needed if supplemented with calcium with D3. This was an opportunity to see if we could get them growing with the only change being Good quality UVB lights, knowing that both breeders have a good knowledge of reptile care and needs. We have often like others wondered which was the better husbandry for bearded dragons and there is much discussion about UVB or supplements only with D3.
These dragons were an opportunity to study the effects a change would have on them, all had stopped growing or only grow slightly in the previous months.
Group 1 were all clutchmates to each other, and when they arrived, on June 29th, they weighed & measured...
Dragon 1 : 1g 5"
Dragon 2 : 5g 7"
Dragon 3 : 15g 8 1/4"
Dragon 4 : 25g 9 1/2"
At the time we received these dragons, all four of these dragons were 9-10 months old.
The ONLY change we made to their care was to provide them with Mercury Vapor bulbs.
Less than 2 weeks later, on July 11th..
Dragon 1 : 11g 6"
Dragon 2 : 14g 7 1/2"
Dragon 3 : 28g 9"
Dragon 4 : 50g 10"
As I said, the ONLY change in their husbandry was to provide them with lots of UVB from Mercury Vapor bulbs (160 Watt Powersuns to be precise). They also had some outside exposure to natural sun light when possible
At this point, Dragon 2 was sent to a new home where he has continued to grow & thrive under plenty of UVB.
By August 8th...
Dragon 1 : 17g 7"
Dragon 3 : 34g 9 12"
Dragon 4 : 90g 11 1/2"
And this is only in a 6 week period starting at 9-10 months of age. This is a hell of a growth spurt and DEFINITELY shows proof that UVB is essential to the health of these animals.
Now, let's take a look at Group 2..
Dragon 5 : 22g, 9 1/2", 11 Months old
Dragon 6 : 34g, 11", 11 Months old
Dragon 7 : 150g, 17", 2 Years old
Dragon 8 : 170g, 14", 2 Years old
Dragons 5 & 6 were siblings, and dragons 7 & 8 appear to be unrelated adults. The two 2 year olds, both showed signs of MBD, and all four of these dragons were supplemented regularly.
The 4 dragons arrived to us on July 1st.
Only 10 days later, on July 11th...
Dragon 5 : 47g, 10"
Dragon 6 : 52g, 11"
Dragon 7 : 200g, 17"
Dragon 8 : 235, 14.5"
Dragon 5 went off to a new home at the same time as Dragon 2 from the first group. She has now reached over 300g, and is over 17" long.
Dragon 6 is still with us, currently weighs 289g and is 16" long. Dramatic change in weight, length, colors and vitality!
ALL 8 dragons showed significant increase in colour, & activity and their appetite DRAMATICALLY improved almost immediately, when the ONLY change made to their husbandry was to provide UVB in the form of mercury vapor bulbs.
ALL of these dragons were far beyond the age they should be for their sizes, and good care was given by knowledgeable keepers. Again, the ONLY difference between their care with us, and that with their previous keepers, was that we offered them lots of UVB lighting.
Conclusion: No doubt with us, UVB is necessary for bearded dragons to thrive as best they can, although they may survive without it and only supplements with D3, all eight of these dragons prove that UVB exposure, along with other good husbandry gives them the best opportunity to thrive and grow to the size and health they should be."
Here is the link to the site I pulled it from:
http://www.reptilerooms.com/Sections+index-req-viewarticle-artid-55-page-1.html
Thanks,
Ian