Cov looj tsom iav dub ntxiv rau qhov ntxoov ntxoo, zoo nkauj dua li, tseem muaj lub luag haujlwm uas qhov ntsuas tseem ceeb tiv thaiv kab mob ultraviolet uas yog.Kev saib xyuas zoo bureau clew, tsis yog txhua lub looj tsom iav dub muaj lub luag haujlwm uas tiv thaiv ultraviolet rays, ob lub looj tsom iav dub uas ua tau raws li cov txheej txheem tsim nyog, hauv kev txo qhov pom kev siv lub teeb kuj tuaj yeem tuav tawm ib feem ntawm ultraviolet rays tib lub sijhawm, paub tseeb tias hnav looj tsom iav dub thiab tsis hnav looj tsom iav dub sib piv, cov hluav taws xob ultraviolet hluav taws xob uas lub qhov muag lees txais tsis nce.Cov looj tsom iav dub tsis zoo uas tsis tiv thaiv koj lub qhov muag los ntawm UV rays tuaj yeem ua rau muaj kev phom sij ntau dua li hnav lawv txhua qhov, vim tias lawv txo cov teeb pom kev zoo rau koj ob lub qhov muag thiab ua rau koj cov tub kawm ntawv nthuav dav.Feem ntau hais lus, looj tsom iav dub muag hauv khw, yuav muaj cov ntawv pom tseeb ntawm lawv cov lo ntsiab muag, cov cim dai lossis cov ntim sab nrauv, ib yam li muaj cov khoom xyaw ntawm lawv cov ntaub ntawm cov khaub ncaws, cov neeg siv khoom yuav tsum ua tib zoo xyuas thaum yuav khoom.Tsuas yog looj tsom iav dub nrog cov ntawv tiv thaiv uv, 100 feem pua ​​​​ntawm UV tiv thaiv, UV380 lossis UV400 tau pom zoo.