The first time I ever saw one of these in person. This replaced a 250 watt HPS westy OV-25 Tudor. This is in South Hadley MA, which is big with the durastars.
Funny thing was this town Installed series 20's up to 150 watts and M-250R2's for 250 watts, guess they decided to stick with AEL all around. This town is a Municipal Owned Utility.
Sticking with AEL wouldn't be a bad move if they used the 115 and 125 or 315 and 325... I know Rte 146 (i think it's 146) at the Mass Pike uses 115s on black deco poles. the first half of the section is with a crazy mix of FCO GEs, Hubbells, AELs, Thomas & Betts, and Cooper lights with no PC sockets and the black paint wearing off, showing the gray paint underneath or bare metal. then all of a sudden every light is a black 250W HPS drop lens 115 with an intermatic shorting cap.
My utility messed around with Durastars in the early 2000s but now they been 125/115 and Cooper fans.