I bought a house that was built in the early 70's.
I replaced a wall sconce which had the usual white, black and ground wire. The power source for the wall box has several wires; two white, two black and two red. I wired the new light using the same wiring pattern that existed previously; the white sconce wire went to the two white wires and the sconce's black wire going to the two red wires. I left the two black wires alone and twisted/capped together.
The light works fine except that it smells hot. I am reluctant to use this light because I don't understand how are why it was wired as it is.
Is it safe to use or should it be wired differently?