Where did you get the information that A. callidryas "requires" uvb and that it's needs for vitamin D3 cannot be met with supplements?
If you bothered to read the papers I cited above, you will see that there were temperatures taken at different levels...
In addition what temperatures would rapidly cause "heat stroke" and what sources are you using for that information?
I never said that Vitamin D3 cannot supplement it's uvb needs, but it requires uvb in the wild for it to properly use calcium.
QUOTE: Although they sleep during the day, Red-Eyed Treefrogs are exposed to ultraviolet rays in their natural habitats. Red-Eyed Tree Frogs should be exposed to supplemental low-output UVB light. This can be accomplished by using a fluorescent lamp designed for frog terrariums. The fluorescent bulb should be replaced every six months. Glass blocks out UVB light, so overhead light sources should be kept behind a wire mesh cover, not a glass or acrylic tank top.
Source Cited: Animal Care -- Red-Eyed Treefrog
And this whole page talks about heat strokes from changes in temperatures.
Heatstroke: nature in an age of ... - Google Books