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Are Smoked Rear Lights Legal in the US?

Not legal

Smoking or tinting the rear lights is not legal in the US. Federal standard FMVSS 108 requires tail, brake and turn lamps to show a specific color and minimum brightness, and smoke film cuts both, so darkened rear lights are non-compliant.

Why?

Rear lighting is safety equipment governed by FMVSS 108. Tail and brake lamps must emit red light at a minimum intensity, and turn signals must be red or amber. A smoke or tint film works by reducing output and shifting the color, which is the opposite of what the standard requires.

That makes darkened rear lights non-compliant federally and an equipment-inspection failure in states that check. A brake light that reads dim or off to the driver behind you is exactly the hazard the rule exists to prevent.

A light, factory-style privacy look achieved with a compliant lamp is one thing, but aftermarket "smoked" film or overlays that cut brightness are for show use only, not the road.

What decides if it's legal

  • Tail, brake and turn lamps must show the required color and brightness.
  • Rear lamps must be red; turn signals red or amber.
  • Smoke tint reduces output and darkens color, which fails FMVSS 108.
  • It is also a state equipment-inspection failure.

Does it depend on your state?

The FMVSS 108 brightness and color requirements are federal, so smoked rear lights are non-compliant nationwide. States enforce it at inspection to differing degrees.

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Sources

This page is general guidance, not legal advice, on the rules in the US for smoked rear lights. The detail varies by exact vehicle and changes over time - confirm with your insurer and the EPA, NHTSA and your state DMV before modifying.