Regardless of what uva or uvb it is putting off, that can't pass through glass, so unless you have an open top or special materials like Solacryl (sp?) for a lid, it won't matter. Any regular, inexpensive bulb at the hardware store will be fine and it's best to have a bulb around 6700 K for plant growth, which has a yellowish tint.
FloraGlo tubes (guessing here that it's the Hagen one?) don't give off ANY UV light of any sort. They're just a branded, more expensive, variation on the Sylvania Grolux. You don't need UV to grow plants, and to be honest as Bryan says, you'd be better of with a 'daylight' tube if you can only have one.
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