With older street lighting systems that came on (and off) in groups via a master control it was common practice to replace them all at the same time, typically at around 70% of the bulb's rated life. These incandescent (filament) bulbs were specially designed for "Group Replacement Service" for many years and the last of them are being made as I speak. These lightbulbs operated on multiple (120V) and street series loops. Typically it was far more economical to group replace than spot-relamping. With individual photocontrols on fixtures resulting in differing operating hours and the lamps of recent decades (not knowing how long they really were going to last) replacements as the bulbs failed generally have been the norm. Of course, early bulb failures within group replacement systems were always promptly given attention when reported.

Added note: the sign in the background reflecting the days of WW2 metal scrap drives....