I'd recommend 4' x 2' x 18", or anything larger but still keeping the 18" of height if you are planning to use a UV tube rather than an MVB. At 18", an 8-12% tube with a reflector still puts out a reasonable amount of UV; once you get to 24", the UV is starting to get pretty weak. Mounting the tube on the backwall isn't ideal either - beardie's eyes are adapted to shield them from overhead UV, not UV from the sides, so when the tube is on the backwall it can cause eye damage. I know I wouldn't want to be staring into a UV tube all day, and I'm sure your beardie wouldn't want to either!
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