With my first Hermanns tortoise I bought a MVB and did not use the tube lighting at all. Recently I added another Hermanns and was advised to switch to tube UVB lighting because the MVB is too drying for babies. So I bought the Reptisun 10 HO T5 bulb and fixture. My problem is that I am worried about how high I should be mounting it? The box says one thing and I've read a ton of threads on here and elsewhere that are conflicting (12 inches, 18 inches, 20 inches, etc). I do not want to harm the tortoises but I want to make sure they're going to get adequate UVB over the winter when they do not get any outside time. Also, I read one place that the 10.0 is too much for Hermanns, and elsewhere it was advised to use a 10.0 for a Russian (don't they have similar requirements?). So now I'm worried I should have gotten a 5.0 instead of a 10. I might be driving myself a little crazy with this but I am so paranoid about doing something that will harm my babies! Thanks for any info.