nice, big encosure for Cyclura cornuta. I wish they'd put those bask lights closer together. one light, doesn't do justice for such a large animal. 2-3 bask lights in a row or triangle-shape, are much better and allow for better thermoregulation. one light, will make them bask for longer periods of time. whereas, a few lights together will give them what is needed. covering the snout-to-vent area and they can go about their business.
Yes the size is fine, and to be fair the room that this enclosure is in along with Green and Yellow anacondas, tropical fish and poison dart frogs is a very warm place, I would assume they have hot rocks as well.
But i take your point strung together the light would give a quicker thermoregulation.