Lexus GS300 Map Light Bulb Size

The Lexus GS300 map light utilizes bulb sizes 12961, 57, 6428, and DE3021 across various production versions. Available data covers the specific range from 1993 through 2006 for the interior lighting components.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2006	12961
1998-2005	57
1994-1997	6428
1993	DE3021

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 1W.	57
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6428
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3021

Other Locations

Additional Notes

The Lexus GS300 map light specifications reference three distinct bulb types across the 1993-2006 model years: the 57, 6428, and DE3021 under the ANSI standard, and the 12961 under Philips nomenclature.
The bulb 57 is the most frequently specified type in the GS300 map light data, covering the 1998-2005 model years. It is a single-filament bulb with a BA9s bayonet base, rated at 12V and 1W.
The BA9s base on the 57 bulb is a small bayonet cap design, which is not interchangeable with wedge or festoon base types also present in this specification set.
The 6428 is a festoon-style bulb with an SV8.5 base, rated at 12V and 5W, and is specified for the Lexus GS300 across the 1994-1997 model years.
The DE3021 is also a festoon bulb but with a 31mm length and end-cap contacts, whereas the 6428 measures 36mm with an SV8.5 base. These two festoon types are not interchangeable despite sharing the same general form factor.
The DE3021 is the sole bulb type specified for the 1993 GS300, and its wattage is not stated in the provided specifications, unlike the other three bulb types which carry explicit wattage ratings.
The 12961 is a Philips-branded part number rather than an ANSI standard designation. It is a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W, and is specified only for the 2006 GS300.
The W2.1x9.5d base on the 12961 is a wedge-type fitting, which is physically incompatible with the BA9s base of the 57 and the festoon end-cap or SV8.5 bases of the DE3021 and 6428.
The 57 and 6428 share the same 12V operating voltage but differ significantly in wattage, with the 57 rated at 1W and the 6428 at 5W, reflecting their use in different lighting applications across model years.
A fitment change occurs between the 1997 and 1998 GS300, where the specified map light bulb shifts from the 6428 festoon type to the 57 BA9s type, indicating a change in the lamp housing design between those model years.