Honda Accord Headlight Bulb Size

Additional Notes

• The 9005 bulb is the most frequently specified type across the Honda Accord headlight data, appearing in both high beam and low beam positions across multiple model years. It is a single-filament halogen bulb operating at 12V and 65W, fitted with a P20d base, and standardized under the ANSI specification used in the US and Canada.
• The 9006 bulb shares the same ANSI standardization and 12V, 55W electrical rating as the H11 but uses a P22d base rather than the PGJ19-2 base found on the H11. These two base types are not interchangeable, meaning a 9006 and an H11 cannot be substituted for one another despite their identical wattage.
• The H11 bulb carries a PGJ19-2 base and is rated at 12V and 55W. Unlike the 9005 and 9006, it originates from the ECE standard used in Europe and worldwide, though it holds approval for use in the US market as well.
• For the 2021 Honda Accord, the low beam position specifies the 9005 only with halogen lamp headlights, while the high beam position lists the 9005 without that conditional note for the same year. The 2019 high beam entry similarly restricts the 9005 to vehicles with halogen capsule headlamps.
• The 2018 Accord presents a split fitment: the high beam uses a 9005 while the low beam uses an H11. These two bulbs have different base types, P20d and PGJ19-2 respectively, and are not interchangeable between positions.
• Sealed beam units, including the H4651, H4652, H4656, H5001, and H5006, function as self-contained assemblies in which the lens, reflector, and filament form a single unit. When a filament fails, the entire assembly requires replacement rather than just an internal bulb.
• The H4651 and H4652 are both 4x6-inch rectangular sealed beam units under the ANSI standard, with H4652 classified as a variant of H4651. The specifications assign H4651 to the high beam and H4652 to the low beam for the 1982 and 1985 Accord, indicating that these two types occupy distinct beam positions and are not interchangeable with each other.
• The H4656 is also a 4x6-inch rectangular sealed beam unit and appears in the low beam position for the 1983-1984 Accord, replacing the H4652 used in 1982 and 1985 for that same position. The H4651 remains consistent in the high beam across 1982-1985.
• The H5001 and H5006 sealed beam units differ in physical form: H5001 is a 4-inch square unit used in the high beam, while H5006 is a 5.75-inch round unit used in the low beam. Both appear across the 1976-1978 Accord and operate at 12V.
• All bulb and sealed beam types listed across the Honda Accord specifications operate at 12V, consistent with the standard electrical system voltage of passenger vehicles in these markets.