Well he has a big side where he is not exposed to this bulb because I did notice it had alot of uvb. U know the worse part? The man put the bulb IN THE TERRARIUM. And I'm planning on getting that uvb lamp I hear great things about it. Also in one of my last comments I actually mentioned carts that measure the UVB they change colors depending on how much radiation it's getting (how darker the purple the more uvb) those actually came with these mercury vapors.If your using a mercury vapor. You can not use this without a solarmeter 6.5 You are risking extreme over exposure using this on an enclosure. They are best used on a large free range.
I really hate these bulbs and that people recommend them for chams without telling them specifics. Due to their high output of UVI and heat trying to get the right UVI level while trying to get the correct heat level is almost impossible.
I would recommend not using this bulb at all and switch to a regular bulb for heat. Then get the correct UVB lighting which is a T5HO fixture and a 5.0 or 6% uvb bulb for it. Basking branch would then sit 8-9 inches down below the screen and the fixture sitting on top of the screen.