How are you measuring temperatures? The stick on thermometers or one with a probe? Or do you have a Temp gun? As for the UVB, if you can, get a strip light instead, like the ReptiSun T5 HO 10.0. Coil bulbs only produce UVB in one spot of the tank instead of the whole length of the tank. In an artificial setting for captive animals, you'll want the UVB to span about 2/3 of the tank as UVB bulbs are weaker than radiation from the sun, so the animals need to be exposed to more of it to compensate for that. Coil bulbs also produce an unreliable amount of UVB because of the way they are shaped and the UV wavelength they output is shorter than in strip lights, making them harsh, and can cause photo-keratitis, which is severe eye damage.
As for night bulbs, companies sell them because they can make money off them. They burn out quickly so people buy them frequently. Plus, many people think all reptiles need to be kept warm all the time, but most need a night time temperature drop in order for their bodies to slow down and relax, just like ours. Just because something is made does not mean they are necessary or safe. A type of beef jerky dog treat was linked to the deaths of over 1000 dogs before they recalled it. And companies like Iams still make "Cat Chow" which is made only of wheat and corn gluten that's flavored with chicken fat. It's the same reason they still sell 1/4 gallon tanks for betta fish, because they can and people will buy into it, thinking it must be good if they sell it at a pet store. But pet stores are like any other company that sell dangerous items, like how CVS sells alcohol and used to sell cigarettes. Companies make terrible products all the time and it's up to us, as owners, to make sure what we introduce to our animals is safe and necessary.