The ordinary color codes for 115v wiring is to have the common ground wire colored white and the voltage hot wire as black. Blacks to blacks and whites to whites. A red wire is usually another voltage hot wire used between switches or another leg of a 220 volt circuit. The safest way to check the wiring of this fixture is to look for continuity between wires (you could use an ohmmmeter.) If the red wire connects to black wires - it is an alternative hot wire. If the red wire connects to the chassis - it is a third wire ground and the manufacturer had a sale on red wire that day instead of using a green wire - the color codes don't have to be the same INSIDE a device as the color codes for wiring outside the fixture.