Lexus IS350 Map Light Bulb Size

The Lexus IS350 map light utilizes 12961 and 168 bulb sizes for the interior lighting components. Available data for the specified vehicle covers the period from 2006 through 2021.

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
2021	12961
2017-2019	12961 (Front and Rear)
2016	12961
2006-2009	168

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The Lexus IS350 map light specifications reference two bulb types across the listed model years: the 12961 and the 168.
Both the 12961 and the 168 are T10 miniature wedge bulbs, meaning they share the same general form factor and lens profile.
The 12961 is a Philips part number designation and carries a W2.1x9.5d base, operating at 12V and 5W.
The 168 is an ANSI standard designation recognized in the US and Canada, operating at 12V and 4.9W.
Despite sharing the T10 form factor, the 12961 and the 168 differ in their base specifications, which is a relevant fitment consideration when substituting one for the other.
The Lexus IS350 uses the 12961 bulb for model years 2016-2021, while the 168 bulb applies to model years 2006-2009, reflecting a generational shift in the specified bulb type.
For the 2017-2019 IS350, the 12961 specification is noted separately for both front and rear map light positions, indicating the same bulb size is used in both locations within the cabin.
The 2016 and 2021 model year entries list the 12961 without a front or rear position distinction in the provided specifications.