Mitsubishi Galant Headlight Bulb Size

Additional Notes

• The 9007 bulb is a dual-filament halogen type with a PX29t base, rated at 12V and 65W/55W, where the higher wattage serves the high beam filament and the lower wattage serves the low beam filament. Its dual-filament design allows a single bulb to handle both functions within one housing, which is reflected in its use across both the high beam and low beam positions on the Mitsubishi Galant for the 2010-2012 model years.
• The 9003 bulb shares the dual-filament halogen principle but uses a P43t base and is rated at 12V, 60W/55W. It served both the high beam and low beam positions on the Galant for the 1999-2003 model years, functioning in the same single-housing, dual-function role as the 9007.
• The 9005 and 9006 bulbs are single-filament halogens, each dedicated to one beam function. The 9005 uses a P20d base at 65W for high beam duty, while the 9006 uses a P22d base at 55W for low beam duty. Their differing base types mean the two bulbs are not interchangeable with each other despite their similar appearance.
• On the Mitsubishi Galant for the 2004-2009 model years, headlamp type determines which bulbs are required. Vehicles without projector-type headlamps use the 9007 for both beams, while those equipped with projector-type headlamps require the 9005 for high beam and the 9006 for low beam, making headlamp style a critical factor in fitment.
• The H4651, H4652, and H4656 designations refer to 4x6-inch rectangular sealed beam units rather than individual replaceable bulbs. In sealed beam construction, the lens, reflector, and filament form a single sealed assembly, so the entire unit is replaced rather than an internal bulb.
• The 1985 and 1987 Galant used the H4656 sealed beam for low beam, while the 1986 model used the H4652 instead. All three years shared the H4651 for high beam. The H4652 is a variant of the H4651 within the same 4x6-inch rectangular sealed beam format.
• All bulb types listed across the Galant's headlight specifications conform to ANSI standards applicable in the United States and Canada, and all operate on a 12V electrical system regardless of bulb type or model year.
• Because the 9005 and 9006 use physically distinct bases (P20d and P22d respectively), and the 9007 uses a PX29t base, none of these three bulb types are cross-compatible with one another, and substituting one for another in a projector or non-projector housing would not be mechanically possible without modification.