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What is the UV light useful for?
This 51 UV LEDs flashlight can be use for hunting scorpions and minerals, hotel room bed bug inspection, rodent contamination, and more. Here you can read our article to learn more: https://www.loftek.us/blogs/news/uses-for-a-uv-black-light-flashlight
How do you use it to detect sperm
"Traditionally, ultraviolet illumination has been recommended to aid in the identification of semen on skin and clothing of these patients. Ultraviolet light (wavelength less than 400 nm) has been shown to cause fluorescence of certain fungi, bacteria, chemicals, and semen." You can read more from this article, hope this will be helpful for you. (https://onlinelibrary.wiley.com/doi/pdf/10.1197/aemj.9.10.1045)