1. Ukukhanya okukhanyayo:
Amandla akhutshwa ngumthombo wokukhanya kwindawo ejikelezileyo ngokweyunithi yexesha kunye nokubangela umbono obonakalayo ubizwa ngokuba yi-luminous flux Φ Imelwe kwiilumens (Lm).
2. Ubunzulu bokukhanya:
Umsinga okhanyayo osasazwa ngumthombo wokukhanya kwicala elithile ngaphakathi kweyunithi eqinileyo ye-engile ibizwa ngokuba bukukhanya komthombo wokukhanya ukuya kwelo cala, okubizwa ngokuba bubushushu bokukhanya ngokufutshane.Imelwe ngesimboli I, kwi-candela (Cd), I= Φ/ W .
3. Isikhanyiso:
Ukukhanya okukhanyayo okwamkelwe kwindlela yenqwelomoya yeyunithi kubizwa ngokuba yi-illuminance, echazwe ku-E, kwaye iyunithi yi-lux (Lx), E= Φ/ S.
4. Ukukhanya:
Ukukhanya okukhanyayo kwesikhanyiso kwindawo yokubonisa iyunithi kwicala elinikiweyo kubizwa ngokuba kukukhanya, okubonakaliswa ku-L, kwaye iyunithi yi-candela ngemitha yesikwere (Cd/m).
5. Ubushushu bombala:
Xa umbala okhutshwa ngumthombo wokukhanya ufana nombala okhutshwa ngumntu omnyama ofudunyezwe kubushushu obuthile, kubizwa ngokuba bubushushu bombala bomthombo wokukhanya, obufinyeziweyo njengobushushu bombala.
Ubudlelwane obuthe ngqo bokuguqulwa kwexabiso leyunithi yokukhanyisa i-LED
Ukukhanya okukhanyayo kwe-1 lux=1 ilumen isasazwe ngokulinganayo kwindawo ye-1 square meter.
I-lumen e-1=ukukhanya okuguquguqukayo okukhutshwe yinqaku lomthombo wokukhanya ngokuqina okukhanyayo kwekhandlela eli-1 kwiyunithi eqinileyo ye-engile
1 lux=ukukhanya okuveliswe ngumthombo wesibane esinokuqina okukhanyayo kwekhandlela eli-1 kwingqukuva eneradiyasi yemitha e-1