But small, personal UV devices are only now becoming mainstream, and the industry is entirely unregulated. They then took the bacteria on the petri dish and scanned it with the Safe & Healthy UV Disinfecting Light for 10 seconds. Within 48 hours, you could see how many of the bacteria cultures the UV devices killed. Busby said the biggest difference in the two products is where the UV light actually hits the product you need to disinfect. It is also important to note that these personal UV devices are not regulated.