I just got an email from the World Chelonian Trust website. They have put the
Dietary Vitamin D3 and UV-B Exposure Effects on Green Iguana Growth Rate:
Is Full Spectrum Lighting Necessary? 2004 Bull. Chicago Herp. Soc.
on their website: http://www.chelonia.org/Articles/Dietary_Vitamin_D3.htm
It ought to be a good read, and provide insight into herbivorous herp D3/UVB