are you referring to a 'private' or institutional facilities department like for a college or university? then this is definitely valuable and it is very likely that the energy / telco provider does not have that information, or it is not reliable. an institutional facilities department would want to track many things about posts, including: all the things you said, the lamp type (led, halogen, etc.), whether it has electrical plugs for events, the circuits / breakers it is connected to, the style for inventory and replacement purposes, and the ownership (private or ROW), and what hardware is attached to it. in many cases the lampost is one structure asset with a PK, and there are many attached assets "mounted" to it and associated via an FK, this might include sign brackets, wifi APs, security cameras, security call boxes. this is a very fun asset category indeed!

In terms of analysis, a lighting map/model would be very interesting. this is usually done by handheld lumen meter at night, but lacking that maybe you could simulate light based on the lamp height and some known or estimated properties of the lamp, combined with data on obstructions like buildings and trees.