I don't think they require it long as you can give them proper temps and gradient. I've never seen a beardie enclosure w/o overhead lighting/heating though. I know they NEED UVB so you'll already need some type of emitter for UVB. If they don't require UVA, I would think you'd able to go without O/H heating.



Mind you this is what I've seen with other peoples' beardies and don't have much hands on XP with them.