Chevrolet Celebrity Headlight Bulb Size

Additional Notes

• The Chevrolet Celebrity used two distinct headlight technologies across its production run. The 1982-1986 model years used sealed beam units, while the 1987-1990 model years used replaceable halogen bulbs.
• The H4651 and H4652 are 4x6-inch rectangular sealed beam units conforming to the ANSI standard for the US and Canadian markets. In a sealed beam design, the lens, reflector, and filament are fused into a single glass unit, meaning the entire assembly is replaced rather than an individual bulb.
• The H4651 handles the high beam function and the H4652 handles the low beam function on 1982-1986 models. The H4652 is a variant of the H4651, differentiated by its beam pattern rather than its physical housing.
• Both the H4651 and H4652 operate at 12V and follow the same ANSI rectangular sealed beam standard, but they are not interchangeable due to their distinct optical configurations for high and low beam output.
• The 9005 bulb, used for the high beam on 1987-1990 models, is a single-filament halogen type rated at 12V and 65W, fitted with a P20d base. The P20d base is a push-and-twist locking connector specific to this bulb family.
• The 9006 bulb, used for the low beam on 1987-1990 models, is also a single-filament halogen type rated at 12V and 55W, fitted with a P22d base. The P22d base is physically distinct from the P20d base of the 9005, making the two bulbs non-interchangeable despite their similar appearance.
• The wattage difference between the 9005 (65W) and 9006 (55W) reflects their respective roles. High beam applications draw more power to produce a longer, wider throw of light, while low beam applications use less power with a more controlled output pattern.
• All four bulb types listed for the Celebrity conform to ANSI standards applicable in the United States and Canada, indicating they meet a regulated photometric and dimensional specification rather than a manufacturer-specific one.