1. Ukukhanya okukhanyayo:
Amandla akhishwa umthombo wokukhanya endaweni ezungezile ngesikhathi seyunithi ngayinye futhi abangela ukubona okubonakalayo kubizwa ngokuthi i-luminous flux Φ Represented in lumens (Lm).
2. Amandla okukhanya:
I-flux ekhanyayo ekhishwa umthombo wokukhanya endaweni ethile ngaphakathi kweyunithi ye-engeli eqinile ibizwa ngokuthi amandla okukhanya omthombo wokukhanya kuleyo ndawo, okubizwa ngokuthi amandla okukhanya ngamafuphi.Imelwe uphawu I, ku-candela (Cd), I= Φ/ W .
3. Ukukhanyisa:
I-flux ekhanyayo eyamukelwa endleleni yendiza yeyunithi ibizwa ngokuthi i-illuminance, evezwa ngo-E, futhi iyunithi ithi lux (Lx), E= Φ/ S .
4. Ukukhanya:
Ukuqina okukhanyayo kwesikhanyiso endaweni yokuqagela kweyunithi endaweni enikeziwe kubizwa ngokuthi ukukhanya, okuvezwa ngo-L, futhi iyunithi iyikhandlela ngemitha yesikwele (Cd/m).
5. Izinga lokushisa lombala:
Lapho umbala okhishwa umthombo wokukhanya ufana nombala okhishwa umuntu omnyama oshiselwa ezingeni elithile lokushisa, kubizwa ngokuthi izinga lokushisa lombala lomthombo wokukhanya, elifushanisiwe ngokuthi izinga lokushisa lombala.
Ubudlelwano bokuguqulwa okuqondile kwenani leyunithi yokukhanyisa kwe-LED
I-flux ekhanyayo ye-1 lux=1 ilume isatshalaliswa ngokulinganayo endaweni eyimitha yesikwele engu-1
I-lumen engu-1=i-flux ekhanyayo ekhishwa umthombo wokukhanya wephoyinti onamandla okukhanya kwekhandlela elingu-1 kuyunithi ye-engeli eqinile
1 lux=ukukhanya okukhiqizwe umthombo wokukhanya wephoyinti ngamandla okukhanya ekhandlela elingu-1 kuyindilinga enerediyasi eyimitha elingu-1