Ukwelapha ngokukhanya bekulokhu kukhona lapho izitshalo nezilwane zikhona emhlabeni, njengoba sonke sizuza ngezinga elithile ekukhanyeni kwelanga okungokwemvelo.
Akukhona nje kuphela ukuthi ukukhanya kwe-UVB okuvela elangeni akuhlangani ne-cholesterol esikhumbeni ukusiza ukwakha uvithamini D3 (ngaleyo ndlela ibe nenzuzo egcwele yomzimba), kodwa ingxenye ebomvu yokukhanya okubonakalayo (600 - 1000nm) iphinde ihlanganyele ne-enzyme ebalulekile ye-metabolic. ku-mitochondria yeseli yethu, iphakamisa isivalo emandleni ethu okukhiqiza amandla.
Ukwelashwa kokukhanya kwesimanje kade kwaba khona kusukela ngasekupheleni kwawo-1800s, kungekudala ngemva kokuba ugesi nokukhanyisa kwasekhaya kwaba yinto, lapho i-Faroe Islands owazalwa u-Niels Ryberg Finsen ehlola ukukhanya njengendlela yokwelapha izifo.
Kamuva uFinsen waqhubeka nokuwina umklomelo kaNobel wezokwelapha ngo-1903, unyaka ongu-1 ngaphambi kokufa kwakhe, ephumelela kakhulu ekwelapheni kokubili ingxibongo, i-lupus nezinye izimo zesikhumba ngokukhanya okugxilile.
Ukwelashwa kokukhanya kwangaphambi kwesikhathi kwakuhilela ukusetshenziswa kwezibani zendabuko ze-incandescent, futhi izifundo ezingu-10,000 zenziwa ekukhanyeni phakathi nekhulu lama-20.Ucwaningo lusukela emiphumeleni yezikelemu, noma izinyoni, abesifazane abakhulelwe, amahhashi nezinambuzane, amagciwane, izitshalo nokunye okuningi.Intuthuko yakamuva kube ukwethulwa kwemishini ye-LED namalaser.
Njengoba imibala eminingi itholakala njengama-LED, nokusebenza kahle kobuchwepheshe kwaqala ukuba ngcono, ama-LED aba inketho enengqondo nephumelelayo yokwelapha ukukhanya, futhi iyindinganiso yezimboni namuhla, nokusebenza kahle kusathuthuka.
Isikhathi sokuthumela: Sep-06-2022