Pontiac J2000 Dome Light Bulb Size

The Pontiac J2000 dome light requires a bulb size of 561 for the interior lighting system. Data for the specified component covers the range from 1982 through 1983.

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
1982-1983	561

Bulb Specifications

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

Other Locations

Additional Notes

The 561 bulb is the sole dome light bulb size listed for the Pontiac J2000, covering the 1982-1983 model years.
The 561 is classified as a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base socket.
Festoon bulbs are held in place by spring-loaded clips that press against the end caps, a mounting method common in interior dome light housings.
The 561 has a nominal length of 44mm, which is the physical span between its two end contacts and determines whether it fits a given festoon holder.
The bulb operates at 12 volts and draws 12 watts, figures consistent with standard automotive electrical systems of that era.
The 561 carries an ANSI designation recognized in both the United States and Canada, indicating it conforms to a standardized specification rather than a proprietary one.
Because festoon bulbs are defined by their length and contact style, substituting a bulb of a different length, even one that is otherwise similar, would result in an improper fit within the dome housing.