Alhambra Low Pressure Sodium street light

This is one of a small number (around 7) of Low Pressure Sodium street light fixtures in Alhambra located on Marengo Ave between Lemon St and Mission Blvd in front of the Home Depot

They've been here for a while judging from their condition of appearance and may have been installed as a demo during the late 70's to early 80's. A Southern California Edison (our primary electric utility) facility is located across the street. No NEMA wattage tags were visible on the three I looked at.