Honda CRX Trunk Bulb Size

Additional Notes

• The Honda CRX trunk compartment uses two distinct bulb types across its production years: the 6428 and the 13050, each with different construction and origin standards.
• The 6428 is an ANSI-standardized festoon bulb rated at 12V and 5W, with a 36mm length and an SV8.5 base, making it a widely available replacement in both the United States and Canada.
• A festoon bulb is a cylindrical lamp that mounts by contact pressure at both ends rather than by a screw or bayonet base, which is a common format for enclosed interior lighting positions such as trunk compartments.
• The SV8.5 base designation refers to the metal end caps on a festoon bulb, where the 8.5 indicates the cap width in millimeters, a detail relevant when confirming physical fitment in the lamp socket.
• The 13050 carries an OEM and Wagner part number designation and is classified as a halogen bulb for a specialty application, operating at 12V with no wattage specified in the available data.
• The Honda CRX (1989-1990) uses the 13050 bulb for the trunk, while the 1988 and 1991 model years use the 6428, meaning the two bulb types are not interchangeable across all production years despite sharing the same vehicle nameplate.
• Because the 1988 and 1991 CRX share the 6428 specification while the 1989-1990 models use the 13050, confirming the exact model year before sourcing a replacement is necessary to avoid a fitment mismatch.
• The halogen classification of the 13050 distinguishes it from the standard incandescent construction of the 6428, as halogen bulbs use a tungsten filament enclosed with a halogen gas fill, which affects both light output characteristics and the bulb's physical housing design.