Lub luag haujlwm tseem ceeb ntawm looj tsom iav dub yog txhawm rau tiv thaiv ultraviolet (UV) rays, tiv thaiv lub qhov muag los ntawm UV puas. Tsis tas li ntawd, looj tsom iav dub tuaj yeem txo qhov khaus ntawm lub teeb muaj zog ntawm lub qhov muag, ua kom pom kev nplij siab. Ntau hom looj tsom iav dub yog tsim rau ntau qhov chaw thiab siv, xws li kev tsav tsheb, kev ua si sab nraum zoov, nuv ntses, thiab lwm yam.
