Comparing photos of each, the #51 appears to have a smaller globe than the #55 but I've also experienced bulbs with the same number but from different manufacturers being different sizes. The #55 also draws nearly double the amperage.
Attach file:
(14.03 KB)
(14.65 KB)
This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=217154