Do these mount directly to my roof, or do I need brackets?

These are designed as roof-mounted units. Mounting hardware and method depend on your vehicle's roof shape and material—you'll want to verify fit with your specific setup before drilling or bonding anything permanent.

Will I need to splice into my vehicle's electrical system?

The wiring kit is included, so you have everything to run power from your battery or existing circuits. Run the harness along your roof line and down through the door jamb or along the A-pillar for the cleanest installation.

Can I replace just one bulb if it burns out, or do I have to buy a new set?

H3 bulbs are a standard automotive bulb type and widely available at auto parts stores. You can replace either bulb individually whenever needed—no need to buy as a pair.