Do these lights require wiring to the vehicle's factory harness?

The switch is included, but you'll need to route power and ground to your battery and chassis. This is a straightforward DIY job with basic hand tools and an understanding of automotive wiring — no cutting or splicing into factory harness required.

Will I need to remove the bumper for installation?

These mount at factory locations, but access varies. Most installs pull the inner bumper panel rather than removing the entire bumper. Have a jack and jack stands on hand.

Can I replace just the bulb if it burns out later?

Yes — H11 bulbs are a standard size and widely available. You can swap in a replacement without touching the housing.