[Angel And The Wolf]

I'm installing a pair of NiLight 18W LED spot lights on my 2010 Prius, which has fog lights. I want to disconnect the fog lights, and use those wires to run the spot lights. My spot lights have red and black wires. What color wire from the original fog light wires should I hook the red to, and what color wire from the original fog light wires should I hook the black to, so that I can turn them on with the original dash mounted fog light switch?