Peterbilt 337 Dome Light Bulb Size

Additional Notes

• The Peterbilt 337 uses the 211-2 bulb for its dome light across the 2010-2017 model years.
• The 211-2 is an ANSI-standardized bulb, meaning its physical and electrical specifications conform to a recognized North American standard shared across the United States and Canada.
• The 211-2 belongs to the festoon bulb family, a cylindrical form factor that mounts by pressing both ends into spring clips rather than inserting into a socket.
• The 211-2 has a length of 41mm, which is a defining fitment factor for festoon bulbs, as the spring-clip housing must match the bulb length precisely.
• The bulb uses an SV8.5 base, a designation that refers to the 8.5mm cap width on each end of the festoon body.
• The 211-2 operates at 12 volts, consistent with the standard electrical system voltage found in most commercial trucks.
• The bulb carries a 12-watt rating, which reflects its power draw and heat output during operation.
• Because festoon bulbs are length-dependent for fitment, substituting a festoon bulb of a different length, even one sharing the SV8.5 base, would not seat correctly in the 337 dome light housing.