Mangaki ama-lumens wokukhanya komgwaqo welanga okufanele ngiwakhethele ukukhanyisa kwangaphandle?
Yini ama-lumens? I-Lumens yitemu lobuchwepheshe lokukhanya kwesibani. Yinani lokukhanya okukhanyayo okukhishwa isibani ngehora. Ngokwemibandela ye-layman, ama-lumens wukukhanya kokukhanya okukhishwa isibani futhi uma isibalo se-lumen siphezulu, isibani sizokhanya kakhulu. Isibalo seLumen…