Wisconsin headlight laws require you to turn your headlamps on from one-half hour after sunset until one-half hour before sunrise, and any other time weather or conditions drop your forward visibility below 500 feet. The rules also set standards for how your lamps are built and aimed, when you must dim your high beams, and which aftermarket upgrades are legal. Most headlight tickets come out to roughly $163 once Wisconsin’s mandatory surcharges are added to the base fine.
When Headlights Are Required
Two conditions trigger the requirement. The first is “hours of darkness,” which Wisconsin defines as the period from one-half hour after sunset to one-half hour before sunrise, plus any other time natural light is too weak to clearly see a person or vehicle on the road at 500 feet.1Wisconsin State Legislature. Wisconsin Code 340.01(23) – Hours of Darkness The second is a “period of limited visibility,” which covers fog, rain, snow, or similar weather that cuts your forward view below 500 feet, even in daytime.2Wisconsin Department of Transportation. Turn Headlights On in Dark, Adverse Weather Conditions
When either condition applies, every required lamp on your vehicle must be lit: headlamps, tail lamps, and clearance lamps if your vehicle has them. There is no grace period, no exception for short trips, and an officer can cite you on that basis alone.
Parking lights do not count. Wisconsin specifically prohibits using parking lights in place of headlamps during hours of darkness. They exist for parked or standing vehicles. If you are moving, your headlamps must be on.
Dimming for Oncoming and Leading Traffic
Every motor vehicle in Wisconsin needs a multiple-beam headlamp system with an upper (high) beam and a lower (low) beam. The high beam has to reveal people and vehicles at least 350 feet ahead, and the low beam has to illuminate at least 100 feet ahead without aiming the brightest part of the light into the eyes of oncoming drivers.3Wisconsin State Legislature. Wisconsin Code 347.10 – Multiple-Beam Road-Lighting Equipment
You have to switch to low beams in two situations: when an oncoming vehicle is within 500 feet, and when you are following another vehicle within 500 feet. A brief flash of your high beams at an oncoming driver who left theirs on is allowed, but you cannot leave them on continuously.4Wisconsin State Legislature. Wisconsin Code 347.12 – Use of Multiple-Beam Headlamps Failing to dim within 500 feet is one of the most commonly written headlight citations.
Equipment That Has to Work
Every motor vehicle needs at least two headlamps mounted symmetrically on either side of the front, each sitting between 24 and 54 inches above the ground.5Wisconsin State Legislature. Wisconsin Code 347.09 – Headlamps on Motor Vehicles You are responsible for keeping all required lamps and reflectors reasonably clean and in proper working order at all times. A single burnt-out headlamp is enough for a ticket, even if the other one still works.
Fog Lamps and Spotlamps
Wisconsin permits up to two adverse weather lamps (commonly called fog lights), mounted on the front below the center of the headlamps.6Wisconsin State Legislature. Wisconsin Code 347.26 – Restrictions on Certain Optional Lighting Equipment They are optional, and the rules for using them are tight.
Fog lamps cannot replace headlamps unless it is absolutely necessary in rain, snow, dust, or fog, and even then only if the vehicle has two fog lamps mounted on opposite sides and both are lit. If you only have one fog lamp, your headlamps must be on whenever that fog lamp is on.6Wisconsin State Legislature. Wisconsin Code 347.26 – Restrictions on Certain Optional Lighting Equipment The safest approach is to treat fog lamps as a supplement and leave your headlamps on.
Spotlamps follow a similar pattern. A vehicle may carry up to two, but they cannot stand in for headlamps. A spotlamp used as an auxiliary driving light has to be aimed at the road surface no more than 150 feet ahead and to the right of center.6Wisconsin State Legislature. Wisconsin Code 347.26 – Restrictions on Certain Optional Lighting Equipment
LED Bulb Swaps and Aftermarket Upgrades
Dropping aftermarket LED bulbs into a halogen housing is one of the most popular modifications and one of the most legally exposed. Federal Motor Vehicle Safety Standard No. 108 governs vehicle lighting across the United States and requires headlamp systems to be tested and certified as complete units: the housing, reflector, lens, and bulb together.7eCFR. 49 CFR 571.108 – Standard No. 108; Lamps, Reflective Devices, and Associated Equipment A replacement bulb has to be the same type the housing was designed and certified for. NHTSA has stated that LED bulbs are not currently permitted in headlamp housings designed for halogen.
That matters in Wisconsin because state equipment enforcement relies on those federal certification standards. A vehicle with LED bulbs in halogen housings tends to produce a scattered, poorly aimed beam that blinds oncoming drivers while reducing your own effective visibility. Factory-installed LED or HID systems are fine, because those were certified as integrated units from the start.
Motorcycles and Mopeds
Motorcycles and mopeds follow the same timing rules as other vehicles: headlamps on during hours of darkness and periods of limited visibility. A motorcycle must have at least one and no more than two headlamps.5Wisconsin State Legislature. Wisconsin Code 347.09 – Headlamps on Motor Vehicles Wisconsin does not require motorcycle headlights to be on at all times, unlike some other states.
Motorcycles, motor bicycles, and mopeds may use a modulating headlamp that cycles the upper beam between high and lower brightness at 200 to 280 changes per minute. This makes the bike more visible to other drivers during daylight. Modulating headlamps cannot be used during hours of darkness.8Wisconsin Department of Transportation. Wisconsin Code 347.115 – Modulating Headlamps for Motorcycles, Motor Bicycles or Mopeds
A moped or motor bicycle with a single-beam headlamp has to aim it so the high-intensity portion of the light does not project above the center of the lamp at 25 feet ahead when the vehicle is loaded.9Wisconsin State Legislature. Wisconsin Code 347.11 – Headlamp Specifications for Mopeds and Motor Bicycles
What a Ticket Actually Costs
Headlight violations in Wisconsin are equipment forfeitures, not criminal offenses. The base forfeiture for most headlamp violations under Sections 347.07 through 347.12 ranges from $10 to $200. For less severe problems like dirty or defective lamps, the range is $10 to $20 for a first offense and $25 to $50 for a second conviction within a year.10Wisconsin State Legislature. Wisconsin Code 347.30 – Penalty for Violating Lighting Equipment Requirements
The number on the ticket is quite a bit higher than the base fine. Wisconsin adds a 26% penalty surcharge to every forfeiture, plus flat fees for court costs, crime victim services, and justice information systems. On a standard headlight violation with a $20 base deposit, those additions push the total to about $163.11Wisconsin Court System. 2025 Deposit/Bail/Bond Schedule No points land on your driving record for equipment violations, but the financial hit is enough to make keeping your lights working the easier path.