I have the power coming into a wall light then to a switch. The wiring is......Power in black connected to the white from the switch, power in white to the white on the light, black from the light to the black on the switch. I want to add an other wall light , 8ft from the 1st light by connecting to the wires on the switch, this saves me ripping out a bunch of dry wall from light to light. Can it be done? I am in Canada, than for your help.