I can imagin having Beardies outside is more than a little worrying, i'd be terrified i'd leap off under a hedge!
The only think i have to worry about with Till is that he seems to think everything is edable, so he'll stand where ever i'v put him down and just try to take a bite out of what ever is infront of him.
Went for the corner of a paveing slab yesterday! Silly boy
Still, i'v taken him out every day its been sunny, even if its only for a short while (because i don't handle the heat very well) because i'm sure there are things in sunlight we can't create in a vivarium.