S13 is a white and UV two lights in one. White light output is 200 lumens, and with four modes. UV wavelength is 365-410 NM. The UV light has all kinds of different uses: For detecting counterfeit currency, credit cards, driver’s license passports, etc. As an investigative tool at the crime scenes helpful in locating and identifying bodily fluids. To verify if there is too much fluorescent brighteners in clothes. Can expose traces of rodent urine and so help to track them. For identifying uranium and vaseline glass, helping to detect ceramic repairs and also modern repairs to fabrics. For detecting Freon/coolant gas leaks on automobile air conditioning units. For the hobbyist it will make finding minerals among all the other rocks Night Fishing.