Suzuki Forenza headlight bulbs utilize H1 size for high beam and H7 size for low beam applications. The replacement chart covers 2004 through 2008 model years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Suzuki Forenza uses the H1 bulb for high beam headlights across all model years from 2004-2008.
The H1 is a single-filament halogen bulb operating at 12V and 55W, fitted with a P14.5s base, and is classified under the ECE standard with approval in the US and Japan.
The low beam headlight position across the same 2004-2008 model range takes the H7 bulb, which shares the same 12V, 55W electrical rating as the H1 but uses a PX26d base instead.
Because the H1 and H7 use different base types, P14.5s and PX26d respectively, the two bulbs are not interchangeable with each other despite sharing identical voltage and wattage ratings.
Both the H1 and H7 are single-filament designs, meaning each bulb serves only one lighting function, which is why the Forenza requires separate bulbs for high and low beam operation.
The ECE classification of both bulbs reflects a regulatory standard applied across European and worldwide markets, with additional approval status in the US and Japan broadening their availability.