I have never seen fluorescent in use in actual street lighting but they were once fairly popular in parking lot and service station lighting. The 6 lamp powergroove fixtures I have are that type. I would say it is worth it to track them down for your collection. They are obviously rare and will not do anything except get more rare! I would love to have one for the collection. A Fluorescent street light would be a great way for me to bust into the streetlight collecting hobby. lol
Yeah, I might get a florescent someday, but I mainly aim for HID and Cobraheads.