You really must look at the current rating of the switch you're using to make sure it's appropriate for the current the lights will draw (the load). I highly recommend using a relay as others have suggested. Hella makes a lot of great relays in many different configurations up to 70 Amps. As an electrical engineer I can tell you that it is best to let the relay handle the current, that's what they're for. Don't bother running a fuse between the switch and the relay. Use the fuse between the relay and the load (lights).

Best of luck

CobraRGuy (Perry)