Notice the unexpected benefit that emerges from these reports:
When the Iolani School in Honolulu specified ultraviolet light in the "C" band (UVC light) to protect students against potential allergy and asthma symptoms that might be linked to mold in the air handlers, they were surprised to discover that the coils looked "factory-clean" just a few weeks later. By providing continuous cleaning of coil and drain pan areas, the UVC devices enabled school administrators to eliminate an $8,000-a-year coil cleaning program.