It's an element of the UVC solution which requires a level of education. Pretty much all forms of disinfecting don't produce a visible result because the matter being sterilised is not visible. For instance, with wiping a table, you see physical particles (e.g, bits of food, dust) being cleaned, rather than microorganism disinfection. What people see is the process, rather than the results. There are elements of the "UVC disinfection process" which help give clues to the fact it is working such as operational lights and the smell of fresher air. Because you typically don't see any "action" involved with UVC disinfection, there is a trust required from the customer that the UVC disinfection is fit for purpose and working effectively, like there is a trust required when using all disinfection products. One of the reasons that best cements trust is using equipment from a globally recognised brand. At Signify our UVC products have been tested in laboratory conditions and the fantastic results reported by third party organisations. This testing is expensive to do but shows our commitment to getting it right.