Peterbilt 325 Dome Light Bulb Size

Additional Notes

• The Peterbilt 325 uses the 211-2 bulb for its dome light across the 2011-2015 model years.
• The 211-2 is an ANSI-standardized bulb, meaning its specifications are governed by a recognized North American standard applicable in both the United States and Canada.
• The 211-2 is a festoon-type bulb, which is a cylindrical lamp that mounts by pressing its two end caps into spring clips rather than using a screw or bayonet socket.
• The bulb measures 41mm in length, which is a critical fitment factor, as festoon bulbs must match the span between the housing's retaining clips.
• The 211-2 uses an SV8.5 base, a designation that refers to a single-contact festoon base with an 8.5mm cap width.
• The bulb operates at 12 volts, consistent with the standard electrical system voltage found in most commercial vehicles.
• At 12 watts, the 211-2 draws a moderate amount of power relative to other festoon bulbs, which can range from as low as 3 watts to over 20 watts depending on application.
• The 211 and 211-2 designations are closely related but not identical; the suffix "-2" indicates a specific variation, and substitution with the base 211 bulb may affect fitment or performance depending on the housing design.