I just remembered another house I went to one time. It was out in the country, set pretty far off the road. It had some more of those commercial type post type fixtures, in black. These were on tall poles though, about what height you’d see for a utility installation, whereas a lot of the HID post top-in-residential installs I see put them at a lower height.
I just looked up the place on Streetview, and these weren’t GE Town and Country, they look more like Cooper Traditionaire models.
The place didn’t look very old, I’d say late 2000s era or so, so probably HPS units.