There have been some studies regarding the use of intensive UV light installations in surgical wards or other settings as a anti-microbial tool. Generally speaking, these are part of a general interest in non-cleaning based anti-microbials in hospitals, such as UV light, O3-based machines, and copper/silver coated surfaces.
The answer to your question will depend on what you consider "lasting" and "significant". They're a relatively new technology, and haven't had a huge penetration into the market yet, so the only evidence you're likely to find is hospital-sized non-randomized trials.
So basically, the answer to your question, as I read it, is "No, but..."
There hasn't been an opportunity for these technologies to show any sort of lasting, significant reduction in hospital acquired infections. But there is some promise that these types of technologies, and those like them, may help reduce the burden of infections when they're used appropriately. The current state of research is figuring out just how workable they are, how to best use them, and what they can and cannot be expected to do. That kind of evaluation is actually what I'm doing as part of my dissertation work, though my focus is on the general concept, rather than a specific device.
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