Problem with that is the ballast inside your Walmart fixture is not made for UVB bulbs. You're probably burning out the phosphorus in the bulbs way faster than intended this making your bulbs less effective in the long run.
Ya I don't think so.
No ballast is made for UVB bulbs. The UV fixtures we use, are just good quality fixtures. None of the UV company's have custom made fixtures or ballasts. They use the same tech as everyone else. I don't think any of them even make the bulbs tbh. I know for a fact Arcadia doesn't, they have made the recipe, but some one else produces the bulb. Same is likely true, for the rest.
Making Floursencent lights, UV or not, (which all of them put out some UV) takes very large machines, in very large factories. That's all China, especially as making them is dangerous. China don't care.
The reptile industry is honestly very small. Things like UV lights, are one thing, where it sells decently often enough, and so somewhat viable to alter a product to suit. Ballasts, we don't even skim the surface of enough fixtures bought and sold, to warrant a custom ballast. Most of the tech we get in this industry, are hammy downs. We are scrounging to fill our needs, more so than having products designed for us specifically.
That fixture likely has a decent ballast. But it's t8, so less UV, and no reflecor, so it's definitely not providing as high of UVI as a T5 with a Reflector.