by ericmark »
Wed Oct 08, 2008 9:45 am
Except where original lamps run off extra low voltage so there is no traditional ceiling rose, the black or blue wires found in a light switch are the switched return live wires not neutral so another lamp can't be tapped into switch it has to come from ceiling rose. Often people use a switched fused spur unit and power the extra lights from the ring main.
Eric