Utah Headlight Laws: Colors, LED Swaps, and Fix-It Penalties

Utah headlight laws require every vehicle to run headlamps from sunset to sunrise and any time weather or low light cuts visibility below 1,000 feet, restrict headlamp color to what federal standards allow, set specific distances for dimming high beams, and treat most violations as infractions with a recommended fine around $110. Equipment problems like a burned-out bulb can be dismissed entirely if you fix them within 14 days.¹²

When Your Headlights Must Be On

Utah Code 41-6a-1603 sets two separate triggers. The first is the clock: headlamps must be on from sunset to sunrise.¹ The statute says sunset, not thirty minutes after. Once the sun is below the horizon, your lights should already be on.

The second trigger is visibility. Whenever people and vehicles are not clearly visible 1,000 feet ahead because of weather or insufficient light, headlights are required.¹ Rain, snow, fog, and dust all count. Streetlights on the road do not get you off the hook; the law measures actual visibility distance, not whether the street itself is lit.

If your car has an automatic headlight function, you comply with the on-when-dark rule as long as the system is operable, engaged, and not manually overridden.¹ Leaving the switch in “auto” is enough.

One boundary worth calling out: daytime running lights are not headlights. Under federal standards, DRLs shut off when the headlamps come on, and they do not activate your tail lights.³ In rain or fog, drivers behind you may not see your car at all. When conditions call for headlights, turn them all the way on.

Dimming High Beams

Utah Code 41-6a-1613 requires you to switch to low beams in two situations:⁴

When an oncoming vehicle is within 500 feet.
When you are following another vehicle within 300 feet.

High beams reflecting off the mirrors of the car ahead can blind that driver as effectively as high beams from oncoming traffic, which is why both directions are covered. A violation is an infraction.⁴

Your low beams also have to actually do their job. The same statute requires beams aimed high enough and bright enough to reveal people and vehicles at a safe distance ahead, without pinning it to an exact footage.⁴ A headlamp so dim or misaligned that it only reaches a few car lengths would fail.

Equipment, Color, and Number of Lamps

Every motor vehicle must have at least two headlamps, one on each side of the front.⁵ Utah Code 41-6a-1601 then adopts the federal motor vehicle safety standard for lighting (49 CFR 571, Standard 108) and gives it the force of state law, covering beam color, intensity, aim, and photometric performance.⁶

Color is where drivers get in trouble. No vehicle other than an authorized emergency vehicle may display a red light visible from directly in front, and only law enforcement may show a forward-facing blue light.⁷ FMVSS 108 also confines headlamp output to white or selective yellow.⁶ Bulbs that throw a purple, green, or deep blue hue violate both rules, and colored lenses or tinted covers can trigger a failed safety inspection along with a citation.

LED Swaps and Aftermarket Lenses

Whether an LED upgrade is legal depends on the housing. If your vehicle came from the factory with a sealed or integral-beam LED headlamp that met FMVSS 108, the assembly is fine. Dropping a replacement LED bulb into a housing designed for halogen or HID is a different question. As of February 2024, NHTSA has confirmed that no LED replaceable light source has been approved under the federal standard, so those drop-in LED bulbs do not conform to FMVSS 108.⁸ Because Utah adopts that federal standard, an unapproved LED replacement bulb can mean a failed inspection and a citation.⁶

Utah’s safety inspection rules also require rejection when a headlamp has any non-clear covering, when a lens is tinted or painted, or when the headlamp shows an improper color.⁹ Smoked covers, colored films, and cracked lenses that scatter or block light all fail. The same code applies to tail lamps and stop lamps.

Penalties and the 14-Day Fix-It Window

Most headlight violations are infractions.¹ Utah’s Uniform Fine Schedule sets the recommended fine for a general traffic infraction at $110, surcharges included. A court can go higher; the statutory maximum for infractions reaches $750 before surcharges.¹⁰

Utah Code 53-8-209 offers a real escape hatch for equipment problems. You are not guilty and owe no fine for an equipment-related infraction under Part 16 of the traffic code if you obtain a safety inspection or proof of repair within 14 days of the citation.² A burned-out headlamp, a cracked lens, or a missing tail light all qualify. Fix it, get it inspected, and bring the proof to court, and the ticket goes away. The window does not apply to a ticket for failing to turn on headlights you actually had in working order.

1
Utah Legislature. Utah Code 41-6a-1603 – Lights and Illuminating Devices — Duty to Display — Time
2
Utah Legislature. Utah Code 53-8-209
3
National Highway Traffic Safety Administration. Interpretation 07-004355as
4
Utah Legislature. Utah Code 41-6a-1613 – Lamp Required for Operation of Vehicle on Highway or Adjacent Shoulder — Dimming of Lights
5
Utah Legislature. Utah Code 41-6a-1604 – Motor Vehicle Head Lamps, Tail Lamps, Stop Lamps, and Other Lamps — Requirements — Penalty
6
Utah Legislature. Utah Code 41-6a-1601
7
Utah Legislature. Utah Code 41-6a-1616
8
National Highway Traffic Safety Administration. 571.108–NCC-230201-001 LED Headlights: M. Baker
9
Cornell Law Institute. Utah Admin Code R714-161-11 – Lighting
10
Utah Courts. Uniform Fine Schedule