A louver for guiding light sold as an integral component of portable or fixed ultraviolet lights for disinfection purposes including purifying air not for medical purposes; A louver for guiding light sold as an integral component of a sanitizing apparatus using ultraviolet light for sanitizing air not for medical purposes; A louver for guiding light sold as an integral component of an automatically operated sanitizing apparatus using ultraviolet light for sanitizing air not for medical purpos...