My two B2255s have the PowerLite logo (oh BTW I got a 400 watt one now ) I think that Powerlite made there own refractor for the B2255 but they used Holophane's for the smaller cobras so thats why they stuck there logo on it.
Acutually a lot of streetlights have holophane made refractors....some of my Westinghouse streetlights has Holophane mark on ait as well as the Westinghouse on it...
My B2255 from 1989 has the same Powerlite logo on the Holophane made #4066 refractor. Sylvania/Powerlite had these customized. The number is to do with the molds,mine has a 1.
@Devonte, maybe type two distribution?