Hi Seema Datta, This method of disinfecting a Lily Pad using a UV light has a high probability of success. There however are no case studies to prove this, therefore we cannot say it will work for sure.
These links below will shed a healthy UV dose on any useful microbes reading.
1) Here is a link to learn more about UV disinfection and how UV light impact plants below: https://growlightinfo.com/the-effect-of-uv-light-on-plants/.
2) Here is a link to an example of how UV is used to disinfect for water treatment: https://viqua.com/water-treatment/uv-water-treatment/how-does-uv-disinfection-work/
Yes, were talking of a extremely quick physical process. But we still need to know for sure how it affects the Pad because it can be alive at this point. Assuming the manufacturing process will not change from how paper cups are made today.
It beats the idea of rinsing it off like a head of Lettice before consumption.
Please let me know if you need any additional information. I am looking forward to speaking with you soon.