marisa wrote:Is this a tube or a compact flourescent? Does the fixture have a reflective backing? If it's a tube and the fixture doesn't have a reflective backing (no aluminum/silver), the 5.0 can be 6 - 8 inches from the basking turtle. I'd put a new 10.0 tube with the same kind of fixture 8 - 10 inches away.
A reflective backing will intensify the strength of the the UVB rays.
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