The Lexus RX450h tail light requires a bulb size of 168 for the specific lighting component located at the rear of the vehicle. Available data covers the period from 2010 through 2015 for the specified automotive application.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus RX450h uses the 194 and 168 bulb types across its tail light positions for the 2010-2015 model years.
Both the 194 and 168 are ANSI-standardized miniature wedge bulbs sharing the T10 form factor and a 12-volt operating voltage.
The 194 bulb operates at 3.78 watts, while the 168 operates at 4.9 watts, making the two electrically distinct despite their shared physical form factor.
The inner tail light position on the Lexus RX450h uses the 194 bulb across all 2010-2015 model years.
The outer tail light position on the Lexus RX450h requires two bulb sizes: the 194 and the 168, both of which are specified for the same 2010-2015 model years.
Because the 194 and 168 share the T10 wedge base, they are physically interchangeable, but their wattage difference means substituting one for the other will alter the intended light output of that position.
The T10 wedge base is a single-contact, pinless design that seats by friction, which is a standard construction across both bulb types listed in these specifications.
ANSI standardization for both bulb types indicates consistent electrical and physical tolerances across manufacturers producing these bulbs for the US and Canadian markets.