Kev qhia ua kom pom kev
Cov duab hluav taws xob tuaj yeem sau tau raws li kev ci ntsa iab, lub npe ntawm cov khoom ntsuas yog" lux" ;, lossis" lux" rau luv luv, thiab chav cim cim yog" lx", uas sawv cev rau lub luminous flux ntawm ib cheeb tsam nyob rau saum npoo ntawm cov ncauj lus. 1 lux yog sib npaug rau 1 lumen / square meter, uas yog, luminous flux uas yog irradiated vertically los ntawm lub teeb ci nrog qhov deb ntawm ib 'meter' thiab lub zog luminous ntawm 1 candela ib square meter ntawm cov raug. Kev ci ntsa iab yog qhov ntsuas tseem ceeb los ntsuas qhov tua ib puag ncig.