I have a PIR lantern that was removed from outside our house when our new conservatory was built. I want to use this again but am not sure of the wiring for it. The lantern has a 2 core cable coming out of it (brown and blue wires), a red wire and a green and yellow earth wire. I would assume that the earth, brown and blue wires connect to the same in our mains circuit but am not sure what the red wire should connect to. Any ideas?