I have a ceiling light that decided to not to work. On inspection I found bare wires were sticking out under cover. I immediately turned off the light circuits at the switch board. What I found was the light circuit wiring intact but the wires had been twisted together to join to the light fixture. The light fixture has three wires blue, brown and green/yellow. The house wiring has red and black. I need to know which wires should be joined in an approved joiner so the light works correctly. Can you please help?