Do these connect to the factory wiring harness or require a separate circuit?

These come with an integrated switch, so you'll route power independently rather than tapping into existing fog circuits. Exact wiring method depends on your install preference — run power from the battery with a relay or tie into an aftermarket switch panel.

Will the smoke lens dim the light output noticeably?

Smoke tint reduces brightness slightly compared to clear, but H11 bulbs are bright enough for functional fog use. If you need maximum output, upgrade to a higher-wattage H11 bulb (check your vehicle's electrical limits first).

What if the lens gets cloudy or the bulb fails after purchase?

Standard return window applies if there's a defect on arrival. Bulb replacement is straightforward — H11 bulbs are common and affordable to swap out yourself.