Ukwelashwa ngokukhanya okubomvu kuyasebenza futhi akugcini nje ngokuqondene nezinkinga zesikhumba kanye nokutheleleka, ngoba lokhu kungasebenza kangcono kwezinye izinkinga eziningana zempilo. Kubalulekile ukwazi ukuthi lokhu kwelashwa kusekelwe kuziphi izimiso noma imithetho, ngoba lokhu kuzovumela wonke umuntu ukuthi asebenze kahle, asebenze kahle kanye nemiphumela yokwelashwa ngokukhanya okubomvu. Ukukhanya kwe-infrared kusetshenziswa kulokhu kwelashwa okunamandla amakhulu kanye nobukhulu obukhulu. Emazweni aseNtshonalanga, odokotela basebenzisa kakhulu lokhu kwelashwa ukwelapha izinkinga zokulala, ukucindezeleka kwengqondo kanye nezinye izifo. Isimiso sokwelashwa ngokukhanya okubomvu asicacile kangako, ngoba sihluke ngokuphelele kwezinye izindlela zokwelapha zombala ezisetshenziswa emzimbeni womuntu.
Isimiso okusekelwe kuso ukwelashwa kokukhanya okubomvu sizoba nezinyathelo ezithile. Okokuqala, lapho imisebe ye-infrared ikhishwa emthonjeni onekhono, khona-ke le misebe ye-infrared izongena ngokujulile esikhumbeni somuntu kuze kufike ku-8 kuya ku-10 mm. Okwesibili, le misebe yokukhanya izolawula nokujikeleza kwegazi futhi kamuva izophulukisa izindawo ezithelelekile ngokushesha. Okwamanje, amangqamuzana esikhumba alimele ayabuyiselwa futhi aphulukiswe ngokuphelele. Kodwa-ke, kungase kube nemiphumela emibi engavamile futhi embalwa evamile iziguli ezingase ziyibone ngesikhathi seseshini yokwelapha evamile. Kusebenza kangcono ekunciphiseni ubuhlungu obukhulu nobungapheli, ukuvuvukala kanye nokungezwani komzimba nesikhumba.