Usually UV bulbs are set up along the length of the enclosure. If it isn't long enough you would be best setting it up where your snake spends most of its time when the light will be on. 15" high should let plenty enough UV reach the snake. You would be best doing a test run outside of the enclosure and checking it to see how hot it gets. If it gets hot and you are worried about your snake touching it you will likely need to order a guard online, unless you can find one locally. If it doesn't get very hot then you don't need to worry about it.
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