Yes, pics are showing , you really DO have a Rankin's , what a cute little baby ! What happened to his tail ?
So the tank is beautiful but is much too large. The uvb , almost any uvb, wil not project that long distance and will be nearly ineffective. Unless you get a Arcadia D3 14 % specialty bulb your dragon will not get any uvb from most bulbs unless you can suspend it down in to the tank. Your intentions are good but the tank is too large. A 20 gallon long [ not tall ] wil be MUCH better suited and he'll never outgrow it being a Rankin's [ with a tail nip he won't exceed 6-7 " as an adult ] and the uvb you have can reach him easily.