Ukuminyana kwamandla okukhanya avela kunoma iyiphi i-LED noma idivayisi yokwelapha nge-laser ingahlolwa 'ngemitha yamandla elanga' - umkhiqizo ovame ukuzwela ekukhanyeni ebangeni elingu-400nm – 1100nm – okunikeza ukufunda ku-mW/cm² noma W/m² ( 100W/m² = 10mW/cm²).
Ngemitha yamandla elanga nerula, ungakwazi ukukala ukuminyana kwakho kwamandla okukhanya ngebanga.
Ungahlola noma iyiphi i-LED noma i-laser ukuze uthole ukuminyana kwamandla endaweni ethile. Amalambu e-spectrum agcwele njengama-incandescent namalambu okushisa awakwazi ukuhlolwa ngale ndlela ngeshwa ngoba okuningi okukhiphayo akukho ebangeni elifanele lokwelapha ukukhanya, ngakho-ke ukufundwa kuzokhuphuka. Ama-Lasers nama-LED anikeza ukufundwa okunembile ngoba akhipha amaza wamaza amaza +/-20 kuphela wobude bawo obushiwo. Amamitha kagesi 'elanga' ngokusobala ahloselwe ukukala ukukhanya kwelanga, ngakho awalinganisiwe ngokuphelele ukuze kukale ukukhanya kwe-LED yamaza okukhanya - ukufundwa kuzoba isibalo se-ballpark kodwa kunembe ngokwanele. Amamitha okukhanya e-LED anembe kakhulu (futhi abizayo) akhona.