There's a row of Crouse Hinds OVZs at the enterances of my old neighborhood off Rt. 198......Earliest I would say installed in 1988...not sure when they were installed...but I remember seeing them there for a long time....
Oh. The utility here uses whatever they have. (250w fixtures always have glass, but 50 and 100w fixtures use whatever they have in the truck) Most times it's a FP lens.
Here they used to put in plastic on high wattages (small and big fixtures on some) but for the big fixtures they tend to brown out....and for 250 watt MV small fixtures, they MELT inwards!!!! But some linemen today are stupid enough to put plastic in!
If it was 250 watt MV or above, it would be glass....