Manje njengoba usungakwazi ukubala ukuthi uthola umthamo muni, udinga ukwazi ukuthi yimuphi umthamo osebenzayo ngempela. Izihloko eziningi zokubuyekezwa kanye nezinto zokufundisa zivame ukuthi umthamo ophakathi kuka-0.1J/cm² kuya ku-6J/cm² ulungele amaseli, ngaphandle kokwenza lutho oluningi kodwa okunye okuningi kuhoxisa izinzuzo.
Kodwa-ke, ezinye izifundo zithola imiphumela emihle ezindaweni eziphakeme kakhulu, njenge-20J/cm², 70J/cm², ngisho naphezulu njenge-700J/cm². Kungenzeka ukuthi umphumela ojulile wesistimu ubonakala kumithamo ephezulu, kuye ngokuthi kungakanani amandla asetshenziswa emzimbeni. Kungenzeka futhi ukuthi umthamo ophezulu uyasebenza ngoba ukukhanya kungena ngokujulile. Ukuthola umthamo we-1J/cm² engqimbeni ephezulu yesikhumba kuzothatha imizuzwana embalwa kuphela. Ukuthola umthamo we-1J/cm² ezicutshini ezijulile zemisipha kungathatha isikhathi esiphindwe kayi-1000, kudinga i-1000J/cm²+ esikhumbeni esingenhla.
Ibanga lomthombo wokukhanya libaluleke kakhulu lapha, njengoba linquma ubukhulu bamandla okukhanya ashaya isikhumba. Isibonelo, ukusebenzisa i-Red Light Device ku-25cm esikhundleni se-10cm kuzokhulisa isikhathi sokufaka esidingekayo kodwa kumboze indawo enkulu yesikhumba. Akukho lutho olungalungile ngokuyisebenzisa usuka kude, qiniseka nje ukuthi uyayikhokhela ngokwandisa isikhathi sokufaka.
Ukubala ukuthi iseshini ithatha isikhathi esingakanani
Manje kufanele wazi ubukhulu bamandla okukhanya kwakho (kuyahlukahluka ngebanga) kanye nomthamo owufunayo. Sebenzisa ifomula engezansi ukuze ubale ukuthi udinga ukusebenzisa imizuzwana emingaki ukukhanya kwakho:
Isikhathi = Isilinganiso ÷ (Ubuningi bamandla x 0.001)
Isikhathi ngemizuzwana, umthamo ku-J/cm² kanye nobuningi bamandla ku-mW/cm²