Ukukhanyisa kwezimo eziphuthumayo yikilasi lezibani ezingakhanyisa ngempumelelo futhi zibonise isiteshi sokuphuma lapho ugesi ovamile wokukhanyisa uhluleka, noma ongaqhubeka nokukhanyisa nokusebenza ngaphandle kokuphazamiseka.Isetshenziswa kakhulu ezindaweni zomphakathi nasezindaweni ezinokukhanya okungaphazamiseki.