I am replacing coiled bulb to Reptisun T5 HO Tube. I have read a lot threads talking about UVB lighting. So I bought a combo with one 5.0, one 10.0 and a fixture hood from Amazon. The product instruction says the 5.0 one is for tortoises, 10.0 is for desert reptiles. Really got me confused. I got a radiated tort. Which one should I use???? The height of the enclosure is about 12 inches. Is the tube safe for that height? Thanks in advance.