The book I have ("Uromastyx plus other common agamids", Jerry G. Wallis, published by The Herpetocultural Library) notes that "UVB light does not penetrate very far, so the tubes should be as close to the lizard as possible - 30 inches (76cm) or less, never father than that. In deep vivaria, provide the lizard with a raised platform that allows it to get closer to the light." (p.24)

This was my initial resource when building my terrarium, and I followed these guidelines. When mounted directly on the underside of the roof, the lizard is 50cm (about 19" from the light, and its highest platform puts it 34cm (about 13.5" from the light. This is without lowering the light at all. I thought this information would be relevant, as it was the guidance I followed originally... is it good advice?

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