What Size Headlight Bulb for a 2018 Hyundai Elantra?

The 2018 Hyundai Elantra commonly uses an H7 bulb for low beams and an H1 bulb for high beams in most halogen-equipped trims, but the exact headlight bulb size can vary by trim level and whether the car has projector or HID/LED headlights. Owners should confirm by checking the owner’s manual, the existing bulb, or an OEM parts lookup using the VIN to ensure an exact match.

Why Headlight Bulb Size Varies on the 2018 Elantra

The question of “what bulb size fits a 2018 Hyundai Elantra?” is more complex than it seems, because Hyundai sold several trim levels (SE, SEL, Value Edition, Eco, Sport, Limited) and used different headlamp housings and technologies across markets. While many North American halogen models share the same basic sizes, some trims and option packages feature projector or HID/LED units that change the bulb type—or eliminate a replaceable bulb entirely.

Common Bulb Sizes for the 2018 Hyundai Elantra (U.S./Canada Halogen Models)

The following list outlines the most commonly documented bulb sizes for the 2018 Hyundai Elantra in North America with standard halogen headlamps. This information is based on typical OEM fitments; it is intended as a guide and must be verified against your specific vehicle configuration.

• Low Beam (halogen reflector/projector, most trims): H7
• High Beam (halogen): H1
• Front Turn Signal: PY21W / 1157-type (varies slightly by market)
• Parking/Position Light: T10 / W5W
• Front Fog Light (where equipped): H8 or H11, depending on trim and housing
• Daytime Running Light (if separate bulb): Often shared with high beam or an integrated LED strip (non-serviceable)

These sizes reflect what most owners of halogen-equipped 2018 Elantras will encounter; however, regional variations, mid-year changes, and optional lighting packages mean your car could differ, so physical or documentation-based confirmation is essential.

Trim-Level and Lighting Package Differences

Hyundai’s trim and package structure influences which bulb you need. A 2018 Elantra SE with basic halogens will not necessarily share the exact same setup as a Limited or Sport model with upgraded lighting.

Base and Mid-Level Trims (SE, SEL, Value Edition, Eco – Halogen)

Most 2018 Elantra SE, SEL, Value Edition, and Eco models sold in the U.S. and Canada were equipped with conventional halogen reflector or projector assemblies, which generally use replaceable H7 low beams and H1 high beams. Fog lights, when present, typically use H8 or H11 bulbs in compact housings low on the bumper.

Higher Trims and Optional Projector / HID / LED Systems

On higher trims such as Limited or Sport, or on vehicles ordered with optional premium lighting packages, Hyundai has used projector-style lamps and, in some markets, HID (xenon) or LED units. In those cases, the low beam may be an HID or LED module rather than a standard bulb. This can change the service procedure and, in some versions, the bulb is not user-replaceable in the traditional sense.

How to Confirm the Correct Bulb Size for Your Car

Because of the potential differences between trims, options, and regions, it is crucial to double-check the bulb size rather than relying solely on general guidance. The following steps offer practical ways to verify the correct size for your specific 2018 Elantra.

1. Check the Owner’s Manual: Look for the “Specifications” or “Bulb Replacement” section, where Hyundai typically lists bulb types for low beam, high beam, fog lights, and other exterior lamps.
2. Inspect the Existing Bulb: Remove the headlight bulb and read the markings on the base or metal collar; it will usually state H7, H1, or another designation.
3. Use Your VIN in an OEM Parts Catalog: Enter the Vehicle Identification Number into Hyundai’s official parts site or a dealership’s system to pull exact factory part numbers and associated bulb types.
4. Consult the Headlamp Housing Label: Some headlamp assemblies have molded or printed information on the back of the housing describing the bulb type (e.g., “LOW: H7, HIGH: H1”).
5. Ask a Dealer or Reputable Parts Store: Provide your VIN and trim level to a Hyundai dealer or established auto parts retailer, and request confirmation of bulb sizes before you buy replacements.

By using at least one documentation source and a physical check, you dramatically reduce the risk of purchasing the wrong bulb or attempting a swap that does not match your headlamp design.

Halogen vs. LED/HID Upgrades for the 2018 Elantra

Many owners consider upgrading from factory halogens to brighter or whiter bulbs. While this can improve nighttime visibility, it introduces legal, safety, and technical considerations that need to be weighed carefully.

Staying with Halogen Replacements

Plug-in halogen replacements that match the original H7 or H1 rating are the simplest option. Premium halogen bulbs can offer better brightness and color temperature but may have shorter lifespans. Always match the wattage recommended by Hyundai to avoid overheating the housing or wiring.

LED or HID Retrofit Considerations

Installing LED or HID “conversion kits” in a housing designed for halogen can produce excessive glare or poor beam patterns if not engineered specifically for that reflector or projector. In several jurisdictions, such retrofits may fall into a legal gray area or be outright non-compliant with road regulations. It is essential to check local laws and, if upgrading, use high-quality, vehicle-specific solutions.

Practical Tips for Replacing the Headlight Bulb

Once you have confirmed the correct bulb size, basic best practices can make the replacement process easier and safer, whether you’re working with H7, H1, or another type used on your 2018 Elantra.

• Disconnect Power When Appropriate: Turn off the ignition and lights; in some cases, disconnect the battery negative terminal to prevent shorts.
• Avoid Touching the Glass: Oils from your fingers can shorten halogen bulb life; hold bulbs by the base or use clean gloves.
• Replace in Pairs: Headlight bulbs age together; changing both low beams or both high beams at the same time ensures even brightness and color.
• Check Beam Aim After Installation: Replacing bulbs can sometimes slightly affect alignment; verify that the beam pattern is even and not dazzling oncoming drivers.
• Secure Dust Caps and Connectors: Make sure all rubber caps and electrical connectors are fully seated to prevent moisture intrusion and intermittent failures.

Following these steps not only extends bulb life but also helps maintain consistent and safe illumination on the road, reducing the risk of glare or unexpected failures.

Summary

For most 2018 Hyundai Elantra models with standard halogen headlights in North America, the low beam is typically an H7 bulb and the high beam an H1 bulb, with fog lights often using H8 or H11. However, variations in trim level, optional projector or HID/LED systems, and regional specifications mean that the only reliable way to be certain is to confirm via the owner’s manual, the existing bulb markings, or a VIN-based OEM parts lookup. Once the correct size is confirmed, using quality, properly rated bulbs and following safe installation practices will help ensure optimal visibility and compliance with lighting regulations.