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The 10 radiates uvb 24" while the 5 radiates it 12". If using a large cage it may be appropriate to use a 10 IMO. I've used both. I think you should take into account the distance of the basking spot from the uvb light. Just my thoughts...
Call me crazy, but someone (maybe Carol) posted a link to an experiment they did with the UVB lights and they said that a 10.0 through screen was putting out as much UV as a 5.0 without screen. And since most of us keep out lights on the outside of the cage, I don't know, I can see how it makes sense. Although you can get the same effect using foil to increase reflection, which is what I'm doing.