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This is my personal opinion. I would only use one 15% UV bulb in a 4 foot fixture based on your cage dimensions. If it is a 2 tube fixture I would use some sort of plant bulb in the second spot.
As far as your question on tube length. A high output 4 foot fixture uses 46“ T-5 tubes. The 5 is...
If you go with the Arcadia 14% I’m fairly confident using 2 uvb tubs will be to much uvb. Personally I would use one of the 14% tubes and then a standard cool white or even a grown light if you are placing any plants in the enclosure. I run a twin tube fixture in my planted Chameleon enclosure...