I completely understand that, and already being around reptile's from birth already knew that frow seeing it in nature, and I have that in my Beardie Enclosure.
BUT is seem's like People with 40G Breeder's with an Adult in there, the Light & Shade method wouldn't really work, that leave's an Adult Beardie so Little room to just free roam under the heat.
I mean in a 4 foot Long Enclosure the Light & Shade method Work's, My Beardie has a Full 12 inche's of shad on the Heat end, and then Multiple Shades spot's all through the Enclosure, and he does use every one of them.
But idk, just seem's like in a 36 inch long enclosure, it just doesn't "give the Beardie enough room to roam under the Sun" I guess.