Great idea but, one issue still looms.
Hospital rooms and equipment are cleaned by trained staff and proven methods. Tests are routinely done to ensure the process is effective.
The vectors for infection are from those that are less "germ" conscious; the patient themselves and their visitors.
We can use the lights to disinfect the rooms, equipment, and the like. But, can we make visitors and the patients go through the light process?
Soon to Come: If you're a government insured patient, example Medicare and Medicaid, you'll get the photo treatment and you won't get a choice in the matter. And, those two set the rules for everybody.
Lastly, will hospitals mandate that visitors undergo the light treatment? And, will it violate somebody's assumed rights?