Interesting letter. But is there a possibility that the frogs don't necessarily know what they need, UVB-wise? For instance the chance that they might be basking in the light simply because it's warm?

In the case of White's, who have a very broad range and greys who may be a little active in the day, but it's hard to say how much, I'd have to guess that both these frogs have UVB requirements below to far below Waxies.