Chevrolet Beretta Dome Light Bulb Size

The Chevrolet Beretta dome light uses bulb size 561 and bulb size 906 for interior illumination. Available information covers the span from 1987 through 1994 for the specified vehicle components.

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
1994	906
1987-1993	561

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	561

Other Locations

Additional Notes

The 561 bulb is a festoon-type unit with end-cap contacts and a 44mm length, operating at 12V and 12W. It serves as the dome light bulb for the Chevrolet Beretta across the 1987-1993 model years.
The 906 bulb is a miniature wedge type (T10) rated at 12V and 8W. It replaces the 561 as the specified dome light bulb for the 1994 Beretta.
Festoon bulbs make electrical contact through metal caps at each end of the tube, while wedge bulbs seat into a socket by friction through a pinched glass base. These two contact types are physically incompatible with each other.
The 561 and 906 are both ANSI-standardized bulbs recognized in the United States and Canada, meaning either type is available through standard North American automotive parts channels.
The wattage difference between the two specified bulbs is notable. The 561 draws 12W, while the 906 draws 8W, reflecting a reduction in power consumption for the 1994 model year fitment.
Because the 906 uses a wedge base and the 561 uses festoon end-cap contacts, the two bulbs are not interchangeable despite both operating at 12V. Socket design governs which type is physically accepted.