Do these use the factory fog light switch, or do they come with their own?

These come with an integrated switch assembly. You'll install the new switch in place of the original factory control, and it wires directly to your existing harness — no modification needed.

Will the smoked lens affect visibility at night?

Smoked housings dim appearance but retain full output brightness. Visibility remains at factory levels; the lens tint is cosmetic, not functional.

What tools do I need to install these?

Basic hand tools cover the job — mostly just screwdrivers and a socket set to remove the bumper fascia and unmount the originals. No drilling, no wiring splicing required.