Mitsubishi Sigma front side marker bulb size is 168 and rear side marker bulb size is 194. The replacement chart covers 1989 to 1990 vehicle production years with bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mitsubishi Sigma uses the 168 bulb for the front side marker position across the 1989-1990 model years, and the 194 bulb for the rear side marker position across the same span.
Both the 168 and 194 are ANSI-standardized bulbs recognized in the United States and Canada, sharing the T10 miniature wedge form factor.
The T10 wedge base is a pin-free design that seats by friction, where the glass envelope is pressed directly into the socket housing.
Although the 168 and 194 share the same T10 wedge base, they operate at different wattages. The 168 draws 4.9W while the 194 draws 3.78W, both on a 12V circuit.
The wattage difference between the two bulbs means they are not interchangeable without affecting circuit load, even though their physical bases are the same T10 format.
The lower wattage of the 194 rear bulb relative to the 168 front bulb reflects a common automotive practice of using slightly less intense lighting at rear side marker positions compared to front ones.