Subaru GLF high beam and low beam headlight bulbs utilize H4651, H6054, and H4652 size specifications, with the bulb sizes varying by beam type and production configuration. The replacement chart covers 1980 to 1982 model years with corresponding bulb size data for each vehicle production year.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Subaru GLF uses two distinct sealed beam sizes across its model years: the 4x6-inch rectangular format (H4651 and H4652) for 1982 and the larger 5x7-inch rectangular format (H6054) for 1980-1981.
All bulb types listed for the Subaru GLF are ANSI-standardized sealed beam units approved for use in the US and Canada, operating at 12 volts.
Sealed beam units are self-contained assemblies in which the filament, reflector, and lens are fused into a single unit. When the filament fails, the entire assembly requires replacement rather than an internal bulb swap.
The H4652, used in the 1982 low beam position, is a variant of the H4651 used in the 1982 high beam position. Both share the same 4x6-inch rectangular sealed beam format, though they are not interchangeable due to differing beam patterns optimized for high and low beam functions respectively.
The H6054 serves both the high beam and low beam positions for 1980-1981, meaning a single sealed beam unit type handles both functions in those years, unlike the 1982 configuration which uses separate unit types for each function.
The shift from the 5x7-inch H6054 to the 4x6-inch H4651 and H4652 formats in 1982 represents a change in physical housing size, meaning the two sealed beam generations are not physically interchangeable without modification to the headlight housing.