Your eyes can’t see UV so that wouldn’t help.
The blue-ish lights you are seeing are HID (high intensity discharge) lights. They work a bit like fluorescent lamps or mercury vapor lamps. Because they are a metal halide lamp containing xenon, you may also see them called “xenon lamps”. They cost a bit more, but they produce more light for less electricity. You can also make a smaller HID lamp with essentially the same beam pattern as you can an equivalent halogen lamp, or if you want the same size as a halogen you can make a better beam pattern.
So, smaller, better performance, more economical to operate, but they cost more up front. The cost difference up front is probably quite a bit larger than the savings you’ll see from reduced electricity usage though.
If the ones you see seem to make it so you can see better, then chances are it’s designed to be the same size as a halogen but with a better/stronger beam pattern.