Thinking about underglow for your car in New Jersey? Here is what the law says, and how to run it legally. Ready to install? See our RGBIC underglow kit and the install guide.

Is Underglow Legal in New Jersey? (2026 Guide)

Two rules are nearly universal across the US: no red light shown to the front and no blue underglow (both reserved for emergency vehicles), and no flashing, rotating, or strobing while driving. Beyond that, states differ. Here is how New Jersey handles it.

Underglow rules in New Jersey

• Colors: Front-visible lamps must be substantially white, yellow, or amber, and rear-visible must be red or amber only. Any other color visible from the vehicle is prohibited, so typical blue, green, or purple underglow visible while driving is not permitted.
• Driving vs parked: The color restriction applies on any street or highway, so colored underglow is safest only when parked on private property.
• No flashing: No flashing or emergency-style lighting.

Underglow while parked or on private property

These laws generally govern vehicles on a public road or highway, so on genuinely private property, a private lot, driveway, car show, or off-road, underglow use is usually far less restricted. It is not a blanket "legal when parked" rule, though. A car parked on a public street is usually still treated as being on the highway, so the color limits (no red or blue to the front) still apply, and red or blue lighting can trigger separate police-impersonation laws regardless of whether the car is moving. Keep to compliant colors and check your local ordinances.

How to stay legal with underglow in New Jersey

• Keep the lights steady-burning, never flashing, strobing, or rotating.
• Show no red light to the front, and avoid blue entirely.
• Do not mimic emergency-vehicle lighting or obscure your license plate.
• Confirm the current rule below and check locally before driving with it on.

The law

New Jersey Revised Statutes 39:3-50 (color of lights). You can read the referenced law here: New Jersey statute.

Ready to install?

Our RGBIC underglow kit lets you dial in any color and keep it steady, and the install guide covers wiring it to a switched power source. Free shipping on all US orders.

New Jersey Underglow FAQ

Is underglow legal in New Jersey?
Underglow is legal but strict on color; colored underglow visible while driving is effectively not permitted. Keep the lights steady, show no red to the front, and avoid blue.

What underglow colors are illegal in New Jersey?
Front lamps must be white, yellow, or amber and rear red or amber; any other visible color is prohibited. Flashing or strobing of any color is not allowed.

Can I have underglow on while parked in a lot?
On genuinely private property, such as a private lot, driveway, or car show, underglow use is generally far less restricted. On a public street a parked car is usually still treated as being on the highway, so the color rules still apply, avoid red and blue, and check your local ordinances.

Updated July 2026.