Ukukhanya okusebenzayo kunokukhanya okukhanyayo kwe-1600-2000lm, kulula kakhulu ukuyisebenzisa ngamehlo futhi akuphazamisi umsebenzi.Idizayini ephathekayo, ingathwalwa kalula nxazonke.Ingabekwa endaweni eyisicaba.Ihuku liyavulwa futhi lilengiswe emoyeni ukuqinisekisa ukuthi indawo osebenzela kuyo ikhanya kahle.