electrical q's

got a quick question. I want to run (4) 100w lights off my roof rack. I need to know can I run all 4 from one switch, or should I run 2 switches. if i can run 1 switch what size relay do i need to run

a 30amp relay will handle the 4 lights. I'd go with AT LEAST a 15amp switch.

i would run two switches because it eliminates the possible hot spots that are created from overloading, this is what i run with 2 30 amp inline fuses. i like it better because i can use one for distance and one for widespread.