What is the low beam headlight bulb size for a 2004 Mitsubishi Eclipse?

The 2004 Mitsubishi Eclipse uses a H4 bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 2004 Mitsubishi Eclipse?

The high beam bulb size for the 2004 Mitsubishi Eclipse is N/A.

Why are my 2004 Mitsubishi Eclipse headlights dim?

Dim headlights on a 2004 Mitsubishi Eclipse can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a H4 LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2004 Mitsubishi Eclipse fog light?

The 2004 Mitsubishi Eclipse uses a H1 bulb for the fog light position.

Is the 2004 Mitsubishi Eclipse single or dual beam?

The 2004 Mitsubishi Eclipse uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 2004 Mitsubishi Eclipse?

Yes, the 2004 Mitsubishi Eclipse comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H4 LED conversion kit for the low beams.

Does the 2004 Mitsubishi Eclipse have fog lights?

Yes, the 2004 Mitsubishi Eclipse takes a H1 bulb for the fog light position.

Did the 2004 Mitsubishi Eclipse change headlight bulb sizes from the previous year?

Yes — the 2004 Mitsubishi Eclipse uses different bulb sizes than the 2003 model. The 2004 generation introduced this bulb configuration.

Is the 2004 Mitsubishi Eclipse the first or last year to use H4 bulbs?

The 2004 Mitsubishi Eclipse is the only year in the 2004 generation to use the H4 bulb for the low beam headlight.

How do I change the headlight on a 2004 Mitsubishi Eclipse?

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 H4 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 2004 Mitsubishi Eclipse?

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 H4 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 2004 Mitsubishi Eclipse headlights?

A pair of halogen H4 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 2004 Mitsubishi Eclipse?

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 H4 position are available as direct plug-and-play replacements.

The 2004 Mitsubishi Eclipse has a unique bulb configuration not shared with adjacent model years.

Fitment Guaranteed for 2004 Mitsubishi Eclipse

What Size Bulbs Does a 2004 Mitsubishi Eclipse Use?

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

Installation Difficulty

Easy (Plug and Play)

Est. Replacement Cost

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

What Lighting System Does the 2004 Mitsubishi Eclipse Have?

The 2004 Mitsubishi Eclipse utilizes a refined lighting configuration featuring 10 distinct bulb positions. It features a comprehensive lighting system powered by a dual-bulb halogen configuration using separate H4 low beam and high beam bulbs for precise light distribution. This model belongs to the mid years of the Eclipse's 1990-2012 production span.

Can You Put LED Bulbs in a 2004 Mitsubishi Eclipse?

Upgrading to LED is one of the most effective ways to modernize your Mitsubishi's appearance and safety profile. We recommend starting your upgrade with the H4 low beams, as they see the most use. Adding a matching LED kit later will complete the look and ensure consistent lighting performance. Don't forget the H1 fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2004 Mitsubishi Eclipse Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	H4	Buy H4 →
Side Marker	1157	Buy 1157 →
Turn Signal Front	1157	Buy 1157 →
Fog Light	H1	Buy H1 →
License Plate	168	Buy 168 →
Parking Light	1157	Buy 1157 →
Brake Light	921	Buy 921 →
Reverse Light	1156	Buy 1156 →
Turn Signal Rear	1156	Buy 1156 →
Trunk Light	DE3022	Buy DE3022 →