What did The aging text box of Ultraviolet rays for?

The container is invisible until you shine an ultraviolet light on it. it’s role as follows:
Some substances are put in long hour shines by sun. they will toggle some question such as: fade, lose luster, cracked . the theory of The aging text box of Ultraviolet rays is : use uv led strip to simulate sun and use condensate water and spurted water to simulate rain and dew. Other word  with the most true of natural environment to test substance or production. Through test to analyze
that the ability of resisting oxidation and intensity . this way for improvement in performance of production. in general we gain damage information for a few years in natural environment .but It only takes a few day or a few week.