I purchased a 2 (60 watt) light hard-wired wall sconce (230 V 50 HZ AC), but want to convert it to a plug in for future use in a different location (in a nursery now). The sconce has 2 white wires and 2 black wires and an additional copper ground wire attached to the lamp base. I have also purchased a polarized lamp cord, electrical caps and a rotary on off switch. Can this be done??? thanks!