Buick Reatta Dome Light Bulb Size

The Buick Reatta dome light requires bulb size 192 or 561 depending on the specific configuration of the interior lighting system. Data for the bulb sizes covers the range from 1988 through 1991.

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
1991	192
1988-1990	561

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3W.	192
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	561

Other Locations

Additional Notes

The Buick Reatta dome light uses one of two bulb types across its production years: the 192 and the 561, both conforming to ANSI standards recognized in the United States and Canada.
The 561 is a festoon-style bulb, meaning it is cylindrical with metal end caps that make contact at both ends of the bulb rather than through a base socket. It measures 44mm in length and operates at 12V with a 12W output.
The 192 is a miniature wedge bulb of the T10 form factor, which uses a wedge-shaped base inserted directly into a socket without pins or end caps. It operates at 12V with a 3W output.
The Buick Reatta (1988-1990) uses the 561 festoon bulb for the dome light across three consecutive model years.
The 1991 Reatta uses the 192 wedge bulb instead of the 561, representing a change in bulb type for the dome light position.
The 192 and 561 are not interchangeable. They differ in physical form factor, socket type, and wattage, with the 561 drawing 12W compared to the 192 at 3W.
The wattage difference between the two bulbs is significant. The 561 at 12W produces considerably more light output than the 192 at 3W, which reflects a functional distinction rather than a simple substitution.