The Lexus RX350 tail light utilizes a 168 bulb size for the rear lighting assembly. Data for the specified component covers the range from 2007 to 2015.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus RX350 tail light specifications reference three bulb sizes across its inner and outer tail light positions: 194, 12961, and 168. All three are T10 miniature wedge bulbs operating at 12 volts.
The 194 bulb is an ANSI-standardized type rated at 3.78W. It is the specified size for both the inner and outer tail light positions on the 2010-2015 RX350.
The 168 bulb is also an ANSI-standardized T10 wedge type, rated at 4.9W, which is notably higher wattage than the 194. It appears in the outer tail light position across the full 2007-2015 model year range covered by the specifications.
The 12961 is a Philips part number rather than an ANSI designation. It uses a W2.1x9.5d base and is rated at 5W, making it the highest-wattage bulb among the three types listed.
For the 2007-2008 Lexus RX350, both the inner and outer tail light positions specify the 12961 bulb, while the 2010-2015 model years specify the 194 for those same positions. These two bulbs differ in wattage despite sharing the T10 form factor.
The outer tail light on the 2007-2008 RX350 carries two separate bulb specifications: the 12961 for one position and the 168 for another, indicating that the outer tail light assembly uses more than one bulb in those model years.
Although the 194 and 168 are both ANSI-standard T10 wedge bulbs at 12V, their wattage ratings differ. The 168 draws 4.9W versus the 194 at 3.78W, and substituting one for the other without accounting for this difference may affect circuit load and light output.
The W2.1x9.5d base designation on the 12961 is the IEC standard notation for the common T10 wedge base, confirming physical compatibility with standard T10 sockets, though wattage differences relative to the 194 and 168 remain relevant for direct substitution.