Here are some old mercury vapor streetlights in a parking lot near my house. I am not an expert at identifying fixtures, so if anyone knows what they are please let me know (the photo is in google street view, but i plan to take some photos of these lights myself sometime in the near future)

Made by a Canadian company called PYLE. Don't know the exact model, but they were North American copies of the Thorn Alpha 3. I think they're 1960's vintage.

Yeah PYLE streetlights. Might be related to the Pyle-National Company. There's some older poles around here with small fused disconnect boxes marked with either name.