What is the low beam headlight bulb size for a 2018 Alfa Romeo 4C?

The 2018 Alfa Romeo 4C uses a HID-D5S LED bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 2018 Alfa Romeo 4C?

The high beam bulb size for the 2018 Alfa Romeo 4C is HID-D5S LED.

Why are my 2018 Alfa Romeo 4C headlights dim?

Dim headlights on a 2018 Alfa Romeo 4C can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a HID-D5S LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2018 Alfa Romeo 4C fog light?

The 2018 Alfa Romeo 4C uses a LED Fog Light bulb for the fog light position.

Is the 2018 Alfa Romeo 4C single or dual beam?

The 2018 Alfa Romeo 4C uses a single bulb (dual filament) headlight system. This means one bulb controls both high and low beams.

Can I install LED bulbs on my 2018 Alfa Romeo 4C?

Yes, the 2018 Alfa Romeo 4C comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a HID-D5S LED LED conversion kit for the low beams.

Does the 2018 Alfa Romeo 4C have fog lights?

Yes, the 2018 Alfa Romeo 4C takes a LED Fog Light bulb for the fog light position.

Did the 2018 Alfa Romeo 4C change headlight bulb sizes from the previous year?

No — the 2018 Alfa Romeo 4C uses the same bulb sizes as the 2017 model. This configuration has been consistent across the 2015–2019 generation.

How do I change the headlight on a 2018 Alfa Romeo 4C?

Turn off the vehicle and open the hood. Locate the headlight assembly from behind, remove the dust cover or retaining clip, disconnect the wiring harness, twist the old HID-D5S LED bulb counter-clockwise to remove it, then insert the new bulb and reassemble. The whole process typically takes 10 to 30 minutes per side depending on accessibility.

Are LED headlights legal for a 2018 Alfa Romeo 4C?

LED bulbs used off-road or in auxiliary lights are legal everywhere. For on-road headlight use, legality varies by state. Many states allow LED retrofits as long as the beam pattern meets DOT standards. For the best legal compliance, choose a DOT-approved HID-D5S LED LED kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

How much does it cost to replace 2018 Alfa Romeo 4C headlights?

A pair of halogen HID-D5S LED bulbs costs $15 to $40, while LED conversion kits run $25 to $60 per pair. If you have a shop do the work, expect an additional $20 to $50 in labor per bulb. Replacing them yourself at home saves the labor cost and usually takes under 30 minutes.

What is the difference between halogen and LED for a 2018 Alfa Romeo 4C?

Halogen bulbs produce a warm yellow light (around 3200K), last 500 to 1000 hours, and draw more power. LED bulbs emit a brighter white light (5000-6000K), last 25,000+ hours, and use less energy. LED upgrades for the HID-D5S LED position are available as direct plug-and-play replacements.

The 2018 Alfa-Romeo 4C shares its bulb sizes with the 2015–2019 generation.

Fitment Guaranteed for 2018 Alfa-Romeo 4C

What Size Bulbs Does a 2018 Alfa-Romeo 4C Use?

Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.

Installation Difficulty

Moderate (Dust covers often present)

Est. Replacement Cost

$15 - $40 (Halogen) / $30+ (LED)

What Lighting System Does the 2018 Alfa-Romeo 4C Have?

Owners of the 2018 Alfa-Romeo 4C will find a total of 12 lighting elements throughout the vehicle's exterior. It features an extensive lighting system powered by a halogen-based setup where a single HID-D5S LED dual-filament bulb handles both low and high beam duties within the same reflector.

Can You Put LED Bulbs in a 2018 Alfa-Romeo 4C?

Upgrading to LED is one of the most effective ways to modernize your Alfa-Romeo's appearance and safety profile. Since your 4C uses a single HID-D5S LED bulb for both high and low beams, ensure your chosen LED kit is "dual-beam" compatible. This allows the LED circuitry to mimic the two-filament design of the original halogen bulb. Don't forget the LED Fog Light fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2018 Alfa-Romeo 4C Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	HID-D5S LED	Buy HID-D5S LED →
High Beam	HID-D5S LED	Buy HID-D5S LED →
Fog Light	LED Fog Light	Buy LED Fog Light →
Brake Light	Brake Light Assembly	Buy Brake Light Assembly →
Dome Light	6411	Buy 6411 →
Turn Signal Front	2827	Buy 2827 →
Side Marker	2821	Buy 2821 →
License Plate	2825	Buy 2825 →
Parking Light	LED Bulb	Buy LED Bulb →
Turn Signal Rear	7506	Buy 7506 →
Reverse Light	921	Buy 921 →
Trunk Light	2825	Buy 2825 →

How do the 2018 Alfa-Romeo 4C's bulbs compare to other years?

The 2018 Alfa-Romeo 4C uses the same bulbs as the 2017 model.

The 2019 model continues with the same bulb sizes.

This bulb configuration covers the 2015–2019 model years. ← 2017 2019 →

Finding the best installation guide...

Other 4C Years

2020 2019 2017 2016 2015 2014

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