So I just replaced a coil uvb bulb with this tube bulb it’s a 15 watt 18” tube by Zilla that came with the fixture. I want to know if this is a good placement for the uvb. IM SCARED that he isn’t getting uvb in his basking spot and I need someone to tell me the best place I can put both of these lights. So he gets the most comfortable setup. I love him and want him to live a happy life! Or if this is a fine placement I’d like to know that to. Thank you!!!