Honda Insight Trunk Bulb Size

The Honda Insight trunk utilizes bulb sizes 12961, 13050, 6428, and DE3021 depending on the specific version. Data for the components covers the range from 2000 to 2022.

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
2019-2022	12961
2010-2014	12961
2006	13050
2004-2005	6428
2003	13050
2002	DE3021
2001	6428
2000	DE3021

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
OEM/Wagner part number. Halogen bulb, specialty application. 12V.	13050
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 12961 is a T10 miniature wedge bulb operating at 12V and 5W, identified by its W2.1x9.5d base. It is a Philips part number and serves as the trunk bulb for the Honda Insight across the 2010-2014 and 2019-2022 model years.
The 6428 is an ANSI-standard festoon bulb with an SV8.5 base, a 36mm length, and a 12V, 5W rating. It fits the Insight for the 2001, 2004, and 2005 model years.
The DE3021 is an ANSI-standard festoon bulb with end-cap contacts and a 31mm length, rated at 12V. Its shorter length distinguishes it from the 6428, and the two are not interchangeable despite both being festoon-type bulbs.
The 13050 is a 12V halogen bulb designated for specialty applications, carrying an OEM/Wagner part number. It is specified for the 2003 and 2006 model years.
Festoon bulbs such as the 6428 and DE3021 differ in length, 36mm versus 31mm respectively, which determines fitment. Using the incorrect length in a festoon socket can result in a poor or failed connection.
The W2.1x9.5d base on the 12961 is a wedge-type fitting, meaning the bulb is held in place by tension rather than a locking mechanism. This base type is not compatible with festoon or end-cap sockets used by the 6428 or DE3021.