In California, legal fog light colors run anywhere on the spectrum from white to yellow, including the warm amber and selective yellow tints common on aftermarket kits. Blue, red, green, and purple are out. The rule sits in Vehicle Code Section 25950, and it applies the same way to factory fog lamps and anything you bolt on later.1California Legislative Information. California Code Vehicle Code – Section 25950
What the White-to-Yellow Range Actually Covers
Section 25950 says a fog lamp’s color “may be in the color spectrum from white to yellow.”1California Legislative Information. California Code Vehicle Code – Section 25950 That wording is deliberately broad. You aren’t stuck with pure white or pure yellow; anything between them is fair game, which is why amber and selective-yellow fog lights sold for foul-weather driving are legal here.
The rule is more generous than the one for headlights, which have to be white. Yellow and amber light scatters less in fog, rain, and dust, so it lights up the road without bouncing glare back at the driver or washing out oncoming windshields.
Colors That Will Get You Ticketed
The same statute that permits white and yellow on the front of a vehicle rules out everything else. Section 25950(a) requires front-facing lamps and reflectors to show white or yellow, with only narrow carve-outs for things like infrared illuminators and autonomous-vehicle markers.1California Legislative Information. California Code Vehicle Code – Section 25950 In practice, the colors that draw citations are blue, red, green, and purple.
Red and blue are worth flagging on their own. Red visible from the front is prohibited because red is reserved for rear-facing lamps under Section 25950(b): taillights, brake lights, and rear reflectors.1California Legislative Information. California Code Vehicle Code – Section 25950 A car showing red from the front makes it hard for other drivers to tell which way it’s facing. Blue is even more restricted. Vehicle Code Section 25258 limits blue warning lights to authorized emergency vehicles operated by peace officers.2California Legislative Information. California Vehicle Code 25258 Blue fog lights risk not just an equipment ticket but the appearance of impersonating law enforcement.
LED and HID Bulb Swaps Are Where Drivers Slip
Dropping LED or HID bulbs into halogen fog housings is one of the most common modifications, and the color-temperature question is where drivers most often cross the line. A warm-white or yellow LED that stays inside the white-to-yellow range can be difficult to distinguish from a factory setup. A cheap kit that throws a bluish-white beam pushes past yellow-to-white into territory that reads as blue to an officer, and that’s a citation.
Federal law adds a layer above the state color rule. FMVSS No. 108 requires lighting to be certified as a complete unit — housing, reflector, lens, and light source together. NHTSA has stated that no LED light source is currently approved for use in a replaceable-bulb headlamp and that aftermarket LED replacement bulbs sold online “do not conform to the requirements of FMVSS No. 108.”3National Highway Traffic Safety Administration. 571.108–NCC-230201-001 LED Headlights, M. Baker That interpretation letter specifically addresses headlamps, but FMVSS 108 governs fog lamps under the same certification framework.
NHTSA regulates the manufacture and sale of lighting equipment, not modifications individuals make to their own vehicles. What’s actually installed on your car is enforced through California state law.3National Highway Traffic Safety Administration. 571.108–NCC-230201-001 LED Headlights, M. Baker So when an officer is looking at your fog lights, the practical test is Section 25950: does the color stay inside the white-to-yellow spectrum? If yes, you’re on solid ground on color alone.
What Happens if Your Fog Lights Are the Wrong Color
An illegal fog light color is a correctable violation under Vehicle Code Section 40303.5, which covers equipment infractions throughout Division 12.4California Legislative Information. California Code Vehicle Code – VEH 40303.5 That’s the fix-it ticket. You get a chance to correct the problem before paying a full fine.
The steps are straightforward. Fix the issue — swap the bulbs, remove the illegal lights, whatever the ticket flags — then take the vehicle to a law enforcement officer who inspects the correction and signs the Certificate of Correction on the back of the ticket. Submit the signed ticket to the court with a $25 dismissal fee.5California Courts. Fix-it Ticket
Ignore it and the math gets worse. Without the correction and a court appearance, the base fine grows with state and county assessments, and you can end up with a hold on your registration or license. A ticket that starts at $25 can climb toward $200 by the time the fees stack up.
Fog Lights Must Run With Your Headlights
One boundary worth naming even though it isn’t about color: Section 24403 allows no more than two fog lamps per vehicle, and they can’t stand in for your headlamps. Fog lights must be used alongside headlights, never instead of them.6California Legislative Information. California Vehicle Code 24403 – Foglamps Getting the color right doesn’t help if you’re running fog lamps alone.